Article
Physics, Applied
Yong Li, Zhiwei Wen, Jia Guo, Yuxian Wu, Yongliang Chen, Weizheng Liang, Y. Zhao
Summary: The relationship between magnetism and superconductivity is a key issue in the field of high-temperature superconductivity. By studying the relaxation dynamics of photoinduced magnetic-polarons and superconductivity quasiparticles, it is found that the photoinduced magnetic-polarons can inhibit the superconducting component, similar to the pair-breaking effect caused by magnetic impurities in the superconductor.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Shuai Shao, Fan Zhang, Zongyuan Zhang, Teng Wang, Yanwei Wu, Yubing Tu, Jie Hou, Xingyuan Hou, Ning Hao, Gang Mu, Lei Shan
Summary: To understand the mechanism of high-Tc superconductivity, it is important to reveal the intrinsic properties of the basic superconducting units, such as the single layered FeSe/FeAs in iron-based superconductors or CuO2 planes in cuprate superconductors. In this study, a scanning tunneling microscopy/spectroscopy (STM/STS) was used to investigate the iron-based superconductor KCa2Fe4As4F2. The results showed that a single FeAs layer covered by a reconstructed K surface with an underlying CaF layer exhibited multi-band superconductivity with a lower Tc compared to its bulk counterpart. In regions with scattered K atoms, a pseudogap was observed, indicating an inhomogeneous superconductivity without long-range phase coherence in real space, which is similar to high-Tc cuprate superconductors. These findings provide a new perspective on the origin of superconductivity in iron-based superconductors.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Multidisciplinary
Zong-Yang Zhao, Ming Li, Tao Zhou
Summary: This study establishes an effective Hamiltonian in real space to describe the superconducting state of graphene materials and conducts self-consistency calculations. The numerical results show that the Yu-Shiba-Rusinov state only appears in the symmetry of the superconducting pair of the traditional s-wave coupling, and the position and strength of the bound state are related to the magnetic moment of the impurity.
ACTA PHYSICA SINICA
(2023)
Article
Physics, Applied
Shin King Loh, Suan Cheng Chuah, Hanh Thi Thu Tran, Roslan Abd-Shukor, Tet Vui Chong
Summary: Polycrystalline NdBaSrCu3-xMxO7-delta samples (M 1/4 Ni or Zn for 0:00 <= x <= 0:10) were prepared and characterized. The effects of magnetic and non-magnetic particles substitution on the superconductivity of the tetragonal NdBaSrCu3O7-delta sample were investigated. The doping concentration did not significantly affect the a- and b-lattice parameters, but the c-lattice parameter increased with both Ni and Zn substitution. Both doping contents led to a decrease in the critical temperature, Tc, and critical current density, Jc(Tp). The results suggested that Zn doping had a greater effect on Tc due to the induction of unpaired charge carriers.
MODERN PHYSICS LETTERS B
(2023)
Article
Materials Science, Multidisciplinary
Dai Nakashima, Ryusuke Ikeda
Summary: This study investigates the magnetic phase diagram of the iron-based superconductor FeSe in high magnetic fields and observes the presence of both fluctuation-induced vortex liquid regime and FFLO vortex lattice. The melting curve of the vortex lattice is studied to gain insight into the phenomenon. It is found that paramagnetic pair breaking narrows the vortex liquid regime, particularly in the temperature range where the FFLO state is stable. The high-field superconducting phase diagrams of FeSe in parallel and perpendicular field configurations are discussed based on the results.
Article
Physics, Multidisciplinary
Jasmin Bedow, Eric Mascot, Dirk K. Morr
Summary: This paper studies the emergence and manipulation of Yu-Shiba-Rusinov states in response to external perturbations of their magnetic environment. By changing the magnetic exchange coupling or through a periodic drive of the impurity moment, the system can be tuned through a time-dependent quantum phase transition. The electronic response of the system to external perturbations can be imaged through the time-dependent differential conductance.
COMMUNICATIONS PHYSICS
(2022)
Article
Metallurgy & Metallurgical Engineering
A. S. Tsapleva, I. M. Abdyukhanov, P. A. Lukianov, K. A. Mareev, M. Kravtsova, V. A. Drobyshev, N. Konovalova, M. Alekseev, D. S. Novosilova, I. I. Saveliev, A. L. Vasiliev, V. V. Artemov, A. B. Mikhailova
Summary: The growing interest of magnetic system developers in strands based on the Nb3Sn superconducting compound with high critical current density in magnetic fields above 12 T necessitates testing various combinations of alloying elements in the superconducting layer and studying their impact on the microstructure and properties of the layer. Titanium and tantalum are commonly used alloying elements in Nb3Sn-based superconductor production, and their individual effects on the electrical properties of Nb3Sn have been studied extensively. However, there are still many questions regarding the combined effects of these elements. We study the microstructure features of two 1 mm diameter Nb3Sn-based strands with the same design and titanium content but different tantalum contents: 4.0 and 7.5 wt%.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Physics, Applied
M. Osipov, I Anishenko, A. Starikovskii, D. Abin, S. Pokrovskii, A. Podlivaev, I Rudnev
Summary: A novel type of scalable high-temperature superconducting magnetic bearing has been proposed and a prototype has been successfully built and tested. The experiment demonstrated contactless levitation of the rotor relative to the stator and rotation, as well as measurement of load curves. Numerical simulation of bearing load characteristics showed good agreement with experimental data.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Lawrence N. Virgin, David B. Holland
Summary: This paper focuses on the natural frequencies and mode shapes of a double cantilever beam system, examining the influence of axial loads and gravity on the vibration modes. Through experimental modal analysis, the effects of orientation on the vibration modes of the system are investigated.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Optics
Federico Roccati
Summary: A key feature of non-Hermitian tight-binding Hamiltonians is the sensitivity of spectrum and eigenstates to boundary conditions, especially leading to the non-Hermitian skin effect under open boundary conditions. A general procedure based on the Green's function method can be used to calculate the eigenstates, with applications to specific models for comparing edge states localization with bulk states.
Article
Physics, Multidisciplinary
Aysevil Salman Durmuslar, Aslan Turkoglu, Miguel Eduardo Mora-Ramos, Fatih Ungan
Summary: This study theoretically investigated the effects of different impurity positions and ionized doping concentrations on the optical absorption coefficients in a delta-doped GaAs well, showing that these factors can lead to shifts in photon energy. The results may be useful for designing and applying devices based on delta-doped structures.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Engineering, Electrical & Electronic
Ziyuan Li, Huapeng Yu, Tongsheng Shen, Ye Li, Wenjun Zhang
Summary: Vector magnetometers have significant importance in aerial and marine navigation due to their advantages of low cost, portability, and high sensitivity. However, the unstable magnetic field anomaly hinders the performance improvement of magnetic compasses. To address this issue, a bionic magnetic compass algorithm based on the theory of radical pairs in birds was proposed. The algorithm establishes stable convergence of magnetic compass deviation at the critical angle and improves heading accuracy. Sea trials demonstrate significant improvement in reservoir and real ocean environments compared to traditional compensation algorithms.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Min Wang, Leyuan Gao, Jie Ren, Denglu Hou, Yunliang Yue, Tiege Zhou
Summary: The electronic structure and magnetic properties of SnO2 (110) surface with anion vacancy and non-metallic elements doping were studied using ab initio calculations based on density functional theory (DFT). It was found that boron, carbon, and nitrogen doping can introduce local magnetic moments on the surface, leading to a high spin state with magnetic moments of 1.38 mu B, 1.80 mu B, and 1.00 mu B, respectively. Further analysis showed that magnetic moments are mainly localized near the doped atoms, with C-C coupling ferromagnetically and N-N coupling antiferromagnetically. The energy difference between the antiferromagnetic state and ferromagnetic state in the C-doped system suggests a Curie temperature likely to be above room temperature.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Multidisciplinary Sciences
Peng Fan, Fazhi Yang, Guojian Qian, Hui Chen, Yu-Yang Zhang, Geng Li, Zihao Huang, Yuqing Xing, Lingyuan Kong, Wenyao Liu, Kun Jiang, Chengmin Shen, Shixuan Du, John Schneeloch, Ruidan Zhong, Genda Gu, Ziqiang Wang, Hong Ding, Hong-Jun Gao
Summary: The authors report evidence of hybridization between field-induced and magnetic adatom-induced Majorana modes in an iron-based superconductor FeTe0.55Se0.45, providing a possible single-material platform for braiding Majorana modes.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Multidisciplinary
Juan Jesus Beato-Lopez, Jose Maria Algueta-Miguel, Cristina Gomez-Polo
Summary: The detection platform based on the non-linear Giant Magnetoimpedance Effect is designed for a contactless and low-cost detector of magnetic nanoparticles. The sensor, consisting of two soft magnetic amorphous wires, shows high detection sensitivity and can efficiently detect magnetic nanoparticles. The analysis of voltage variations and selection of the second harmonic for prototype development contribute to the platform's effectiveness in detecting magnetic nanoparticles.
Article
Chemistry, Inorganic & Nuclear
Hong Yan, Kotaro Fujii, Houria Kabbour, Akira Chikamatsu, Yu Meng, Yoshitaka Matsushita, Masatomo Yashima, Kazunari Yamaura, Yoshihiro Tsujimoto
Summary: Researchers have successfully grown a new gallium oxysulfide single crystal, La4Ga2S8O3, with disulfide pairs using a KI molten salt. The disulfide pairs dominate the valence band maximum and conduction band minimum, making La4Ga2S8O3 a direct-type semiconductor with an optical band gap of 2.45 eV. This research suggests that band gap engineering using multiple anions is a promising approach for developing novel photocatalysts with suitable band gap energies for water splitting and high photocorrosion resistance.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Zhengxian Li, Deping Guo, Kui Huang, Guodong Ma, Xiaolei Liu, Yueshen Wu, Jian Yuan, Zicheng Tao, Binbin Wang, Xia Wang, Zhiqiang Zou, Na Yu, Geliang Yu, Jiamin Xue, Zhongkai Liu, Wei Ji, Jun Li, Yanfeng Guo
Summary: We observed an exceptional weak antilocalization (WAL) effect in an Fe5-x GeTe2 nanoflake, which can persist up to 120 K, indicating the dual nature with both itinerant and localized magnetism of 3d electrons. The WAL behavior is characterized by the magnetoconductance peak around zero magnetic field and is supported by the calculated localized nondispersive flat band around the Fermi level. The peak-to-dip crossover starting around 60 K in magnetoconductance is visible, which could be attributed to temperature-induced changes in Fe magnetic moments and the coupled electronic band structure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Condensed Matter
Yichen Yang, Hengzhe Lu, Jian Yuan, Zhengtai Liu, Zhicheng Jiang, Zhe Huang, Jianyang Ding, Jiayu Liu, Soohyun Cho, Jishan Liu, Zhonghao Liu, Yanfeng Guo, Yi Zheng, Dawei Shen
Summary: We report the low-energy electronic structure of KMnBi, a two-dimensional antiferromagnetic material, measured by angle-resolved photoemission spectroscopy. Electric transport measurement and other techniques are used to study the evolution of electric transport characteristics with varied flake thicknesses, which consistently reveal the existence of a probable antiferromagnetic ground state. The phase transition temperature ranges from 220 K to 275 K, depending on the thickness. Our results suggest that multilayer KMnBi is a promising 2D antiferromagnetic platform for device applications.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Multidisciplinary
Zhicheng Jiang, Haiyang Ma, Wei Xia, Zhengtai Liu, Qian Xiao, Zhonghao Liu, Yichen Yang, Jianyang Ding, Zhe Huang, Jiayu Liu, Yuxi Qiao, Jishan Liu, Yingying Peng, Soohyun Cho, Yanfeng Guo, Jianpeng Liu, Dawei Shen
Summary: Kagome superconductors AV(3)Sb(5) (A = K, Rb, Cs) offer a rich research area for studying intriguing phenomena such as nontrivial band topology, superconductivity, giant anomalous Hall effect, and charge density wave (CDW). The C (2) symmetric nematic phase in AV(3)Sb(5) has gained significant attention due to its potential inheritance of the unusual superconductivity symmetry. However, the direct evidence of rotation symmetry breaking in the CDW state and its underlying mechanism are still unclear. The observed unconventional unidirectionality in KV3Sb5 may provide important insights into its peculiar charge order and superconductivity.
Article
Physics, Multidisciplinary
Shaofeng Duan, Wei Xia, Chaozhi Huang, Shichong Wang, Lingxiao Gu, Haoran Liu, Dao Xiang, Dong Qian, Yanfeng Guo, Wentao Zhang
Summary: The ultrafast electronic structures of 1T-TiSe2, a charge density wave material, were studied using high-resolution time- and angle-resolved photoemission spectroscopy. The study found that the populations of quasiparticles drove ultrafast electronic phase transitions in 1T-TiSe2 within 100 fs after photoexcitation. A metastable metallic state, different from the equilibrium normal phase, was observed below the charge density wave transition temperature. The photoinduced metastable metallic state resulted from the coherent electron-phonon coupling process, where the motion of atoms was halted, and its lifetime was prolonged with increasing pump fluence.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Boqin Song, Tianping Ying, Xianxin Wu, Wei Xia, Qiangwei Yin, Qinghua Zhang, Yanpeng Song, Xiaofan Yang, Jiangang Guo, Lin Gu, Xiaolong Chen, Jiangping Hu, Andreas P. Schnyder, Hechang Lei, Yanfeng Guo, Shiyan Li
Summary: The recently discovered kagome metals AV(3)Sb(5) (A = Cs, Rb, K) exhibit intriguing phenomena including charge density wave (CDW) with time-reversal symmetry breaking and possible unconventional superconductivity. In this study, we observe a non-monotonic evolution of CDW temperature (T-CDW) with flake thickness reduction towards the atomic limit, and the superconducting transition temperature (T-c) features an inverse variation with T-CDW. We propose that the weakening of electron-phonon coupling and crossover to dominantly electronic interactions contribute to the non-monotonic thickness dependence of T-CDW.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Xun Kang, Ryuta Ishikawa, Alexei A. Belik, Yoshihiro Tsujimoto, Satoshi Kawata, Kazunari Yamaura
Summary: The exchange bias effect is crucial in semiconductor technology, but conventional materials relying on interfaces face manufacturing challenges. This study synthesizes a novel magnetic material, Cd2FeOsO6, which exhibits a strong exchange bias effect and provides insights into its unique mechanism. These findings highlight the potential of using 5d elements to enhance the exchange bias traits of bulk materials.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kouta Kazama, Masato Sakano, Kohei Yamagami, Takuo Ohkochi, Kyoko Ishizaka, Terumasa Tadano, Yusuke Kozuka, Hidetoshi Yoshizawa, Yoshihiro Tsujimoto, Kazunari Yamaura, Jun Fujioka
Summary: We investigated the charge transport property, thermoelectric effect, and electronic state of the electron-doped narrow gap semiconductor Ca1-xLaxPd3O4 through transport measurement, optical/photoemission spectroscopy, and ab initio calculation. The high-quality polycrystalline samples of Ca1-xLaxPd3O4 were synthesized using the high-pressure synthesis technique. Electron doping significantly reduced the resistivity and resulted in a metallic state at a small doping level. The power factor in the present material was much higher than that of the hole-doped analog of CaPd3O4, likely due to the relatively low resistivity and high electron mobility from the dispersive Pd 4d(x2-y2) conduction band.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Siobhan M. Tobin, Jian-Rui Soh, Hao Su, Andrea Piovano, Anne Stunault, J. Alberto Rodriguez-Velamazan, Yanfeng Guo, Andrew T. Boothroyd
Summary: We conducted neutron scattering measurements on YbMnSb2 to investigate the magnetic moments and their interaction with Dirac fermions. Our results revealed that the magnetic moments are localized on the Mn atoms in the paramagnetic phase, and the interlayer exchange in YbMnSb2 is significantly larger than in similar compounds with Bi instead of Sb. We argue that the coupling between the Mn local magnetic moments and the topological band states is more significant in YbMnSb2 compared to the Bi compounds.
Article
Materials Science, Multidisciplinary
Kunya Yang, Wei Xia, Xinrun Mi, Long Zhang, Yuhan Gan, Aifeng Wang, Yisheng Chai, Xiaoyuan Zhou, Xiaolong Yang, Yanfeng Guo, Mingquan He
Summary: We measured the heat capacity, electrical, and thermal transport of kagome metals AV3Sb5 (A = K, Rb, Cs). In all three compounds, the short-range charge fluctuations above the charge density wave (CDW) transition temperature TCDW strongly scatter phonons through electron-phonon coupling, leading to glasslike phonon heat transport, where the phonon thermal conductivity decreases weakly upon cooling. Once the long-range charge order is established below TCDW, the short-range charge fluctuations are suppressed, and the typical Umklapp scattering dominated phonon heat transport is restored. The glasslike phonon thermal conductivity induced by charge fluctuations implies significant electron-phonon coupling in AV3Sb5.
Article
Materials Science, Multidisciplinary
Xintong Chen, Xiangqi Liu, Wei Xia, Xinrun Mi, Luyao Zhong, Kunya Yang, Long Zhang, Yuhan Gan, Yan Liu, Guiwen Wang, Aifeng Wang, Yisheng Chai, Junying Shen, Xiaolong Yang, Yanfeng Guo, Mingquan He
Summary: We report the electrical and thermal transport properties of single-crystalline kagome metals ATi3Bi5 (A = Rb, Cs). Unlike structurally similar kagome superconductors AV3Sb5, no charge density wave instabilities are found in ATi3Bi5. Superconductivity appears at low temperatures below 5 K in ATi3Bi5, but bulk superconductivity is not observed. Similar to AV3Sb5, ATi3Bi5 shows a nonlinear magnetic field dependence of the Hall effect below about 70 K, indicating a multiband nature. In contrast to AV3Sb5, thermal conductivity in ATi3Bi5 is dominated by electronic contributions instead of phonons and electron-phonon coupling. Calculated electronic structures of ATi3Bi5 suggest that van Hove singularities are situated well above the Fermi energy. The absence of charge orders in ATi3Bi5 is closely associated with minor contributions from electron-phonon coupling and/or van Hove singularities.
Article
Physics, Multidisciplinary
Qian Xiao, Yihao Lin, Qizhi Li, Xiquan Zheng, Sonia Francoual, Christian Plueckthun, Wei Xia, Qingzheng Qiu, Shilong Zhang, Yanfeng Guo, Ji Feng, Yingying Peng
Summary: The recently discovered Kagome family AV3Sb5 (A = K, Rb, Cs) exhibits various physical phenomena, including non-trivial topological electronic structure, giant anomalous Hall effect, charge density waves (CDW) and superconductivity. In this study, we investigate the CDWs in CsV3Sb5 using x-ray scattering experiments and density-functional theory calculations, and demonstrate the coexistence of 2 x 2 x 2 and 2 x 2 x 4 CDW stacking phases. The competition between these CDW phases is revealed by tracking the temperature evolution of CDW intensities and different transition temperatures during warming-and cooling measurements. Additionally, a meta-stable quenched state of CsV3Sb5 is identified after fast-cooling process. Our study provides insights into the properties of CsV3Sb5 and the coexistence of competing CDW stackings in this system.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Jian-Yang Ding, Zheng-Tai Liu, Zhe Huang, Zhi-Cheng Jiang, Yi-Chen Yang, Zhong-Hao Liu, Ji-Shan Liu, Yan-Feng Guo, Da-Wei Shen
Summary: Layered transition metal dichalcogenides have novel physical properties and great potential for applications. WTe2, which has an extremely large unsaturated magnetoresistance and is theoretically predicted to be a type-II Weyl semimetal, has been extensively studied. This study systematically probes the electronic structure of WTe2 at room temperature using high-resolution angle-resolved photoelectron spectroscopy (ARPES). The findings reveal the electronic structure features of WTe2 at room temperature and provide new insights into the development of room-temperature topological quantum devices.
Article
Materials Science, Multidisciplinary
Jie Chen, Jiaming He, Yanyao Zhang, Stella Chariton, Vitali Prakapenka, Kazunari Yamaura, Jung-Fu Lin, J. B. Goodenough, J. -s. Zhou
Summary: In contrast to RNiO3, the metal-insulator transition temperature in NaOsO3 is not affected by pressure. The crystal structure of NaOsO3 responds to high pressure in a rarely studied manner, leading to changes in the local structure. A recent study indicates a phase transition occurring at around 18 GPa. In this study, single-crystal diffraction experiments were conducted to investigate the structural changes of NaOsO3 under high pressures up to 41 GPa.
Article
Materials Science, Multidisciplinary
Hiroaki Hayashi, Yuichi Shirako, Lei Xing, Alexei A. Belik, Masao Arai, Masanori Kohno, Taichi Terashima, Hiroshi Kojitani, Masaki Akaogi, Kazunari Yamaura
Summary: In this study, the anomalous Hall effect in the cubic kagome antiferromagnet Mn3Sb is successfully measured, validating its theoretical predictions. These findings contribute to a comprehensive understanding of the anomalous Hall effect in noncollinear antiferromagnetic materials.
