Article
Physics, Multidisciplinary
Jean-Come Philippe, Alexis Lespinas, Jimmy Faria, Anne Forget, Dorothee Colson, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Indranil Paul, Yann Gallais
Summary: Anisotropic strain selectively affects the role of nematic fluctuations in promoting superconductivity. Our results confirm the significance of nematic fluctuations in electron pairing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Qiang Zou, Mingming Fu, Zhiming Wu, Li Li, David S. Parker, Athena S. Sefat, Zheng Gai
Summary: Electronic inhomogeneities in Co, Ni, and Cr doped BaFe2As2 single crystals were compared in different bulk property regions. Machine learning was used to categorize the inhomogeneous electronic states, revealing different origins and roles. While the relative percentages of electronic states varied in different samples, the total volume fractions were similar.
NPJ QUANTUM MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jaafar N. Ansari, Karen L. Sauer, Igor I. Mazin
Summary: In this study, the effect of Co doping on the real-space nematic fluctuations in BaFe2As2 is investigated by combining nuclear magnetic resonance data with first-principles calculations. It is found that the dynamics of nematic fluctuations are exceptionally slow even in the formally tetragonal phase.
Article
Physics, Multidisciplinary
Haruyasu Sato, Mitsuhiro Akatsu, Ryosuke Kurihara, Yoshiaki Kobayashi, Yuichi Nemoto
Summary: The critical properties originating from degenerate orbitals at the ferro-quadrupole quantum critical point (QCP) in the iron pnictide superconductor Ba(Fe1-xCox)2As2 were investigated through ultrasonic experiments. The temperature dependence of various parameters, such as the elastic soft mode C66, Jahn-Teller energy Delta Q, Weiss temperature Theta Q, and hexadecapole susceptibility ultrasonic attenuation coefficient alpha 66, near the QCP were found to exhibit significant changes. The unconventional critical exponent z nu was observed to be 3 near the QCP, suggesting enhanced quantum fluctuations. These observations indicate the potential key role of order parameter fluctuations in the superconductivity.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Materials Science, Multidisciplinary
Teklie Lissanu Tegegne, Gebregziabher Kahsay
Summary: This study investigated the mathematical expressions of temperature and angle dependence of magnetic fields and Ginzburg-Landau characteristics in iron-based superconductors. Phase diagrams were plotted based on experimental values, showing the relationship between various parameters with temperature and angle variations. The theoretical investigation was found to be consistent with the obtained experimental results.
JOURNAL OF MAGNETICS
(2021)
Article
Physics, Applied
Li-Xin Gao, Teng Wang, Qi-Ling Xiao, Wen-Lai Lu, Fei Chen, Gang Mu, Jun-Yi Ge
Summary: Systematic ac susceptibility measurements were conducted to investigate the flux dynamics in a high quality KCa2Fe4As4F2 single crystal. The study revealed the presence of strong intrinsic pinning in this material. The critical field between single vortex pinning state and collective pinning state was determined, and the correlation between activation energy and magnetic field intensity as well as planar defects was discovered.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Taichi Terashima, Shinya Uji, Teng Wang, Gang Mu
Summary: This study reports the phenomenon that the quantum-oscillation frequencies exhibit a negative shift, which can be utilized to identify Dirac/Weyl fermions, but there is a deviation between experimental results and theoretical predictions at lower temperatures.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Taichi Terashima, Hishiro T. Hirose, Naoki Kikugawa, Shinya Uji, David Graf, Takao Morinari, Teng Wang, Gang Mu
Summary: In this study, the resistivity and conductivity were measured in CaFeAsF, and the emergence of the nu = 0 quantum Hall state was observed under high magnetic field strengths.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Applied
Aobo Yu, Tianzhu Zhang, Donghui Fan, Pusheng Yuan, Wei Peng, Hao Li, Chengtian Lin, Gang Mu, Xiaofu Zhang, Lixing You
Summary: The current-voltage (I-V) characteristics of a single-crystalline Bi2223 sub-microbridge with 2.5 unit cells thickness were investigated systematically. The experimental results were well described by the scaling theory for a quasi-2D vortex glass (VG) phase transition, and a phase diagram revealing the VG and vortex liquid phase was constructed. The findings suggest that a high pinning force density may enhance the VG phase transition temperature and suppress the dynamical critical exponent z.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Feng Li, Wei Liu, Jianxing Ma, Mingsheng Long, Xiaojie Lou, Kai Li, Chunchang Wang, Lei Shan
Summary: By introducing Bi0.5Li0.5TiO3 dopant, the electrocaloric effect (ECE) performance of NaNbO3-xBi(0.5)Li(0.5)TiO(3) (x = 0.08, 0.10, and 0.12) system in different phases (P, Q, and R) was studied. It was found that the addition of dopant changed the phase structure of the material and improved its ECE performance, especially in x = 0.10 where a dual peak ECE phenomenon occurred.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Changti Pan, Jiahui Zhao, Baojie Zhang, Jie Wang, Xiaokun Huo, Li Yang, Kun Xu, Yu Zhou, Lei Shan, Yunxiang Lin
Summary: The lattice Se atom-modified CoOOH electrocatalyst with a lower energy barrier was obtained through the electrochemical reconstruction of the Co0.85Se precatalyst, and it exhibited superior oxygen evolution reaction (OER) activity, which was consistent with theoretical predictions. Designing and fabricating electrocatalysts with ingenious lattice modifications are crucial for achieving a highly efficient OER process.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Applied
Xiaoni Wang, Lijie Wang, Yixin Liu, Wanpeng Gao, Yu Wu, Zulei Xu, Hua Jin, Lu Zhang, Wei Peng, Zhen Wang, Wei Li, Gang Mu, Zhirong Lin
Summary: We report the upper critical field of NbN films in both vertical and parallel orientations, finding that the critical field in the parallel direction exceeds the paramagnetic limiting field, while the perpendicular one approaches it. The temperature dependent perpendicular critical field can be described by the extended Werthamer-Helfand-Hohenberg model considering the Pauli spin paramagnetism. Meanwhile, the parallel data shows two-dimensional superconductivity in the temperature range near the critical temperature. Our results reveal the enhanced Pauli paramagnetic effect with decreasing temperature.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Shuang Wang, Degong Ding, Pai Li, Yanping Sui, Guanyu Liu, Sunwen Zhao, Runhan Xiao, Chuang Tian, Zhiying Chen, Haomin Wang, Chen Chen, Gang Mu, Yixin Liu, Yanhui Zhang, Chuanhong Jin, Feng Ding, Guanghui Yu
Summary: The density and spatial distribution of dopants play an important role in the properties of TMDCs materials. A phenomenon called concentration phase separation (CPS) is observed where an interface with a steep doping concentration change is formed at high doping concentrations. The difference in the spatial distribution of dopants on both sides of the interface can be identified using various characterization techniques. Understanding these abnormal phenomena is crucial for the design of TMDCs devices.
Article
Chemistry, Multidisciplinary
Hongwei Shi, Kai Li, Feng Li, Jianxing Ma, Yubing Tu, Mingsheng Long, Yilin Lu, Weiping Gong, Chunchang Wang, Lei Shan
Summary: This study designs the (1 - x) (0.65BiFeO(3)-0.35BaTiO(3))-xLa(0.5)Na(0.5)TiO(3) (BF-BT-xLNT) system, and significantly improves the piezoelectric properties, relaxor property, and resistivity of the material by adding La(0.5)Na(0.5)TiO(3). The thermal stability of electrostrain is achieved at the x = 0.04 composition, making this material suitable for high-temperature piezoelectric and stable electrostrain applications.
Correction
Chemistry, Inorganic & Nuclear
Changti Pan, Jiahui Zhao, Baojie Zhang, Jie Wang, Xiaokun Huo, Li Yang, Kun Xu, Yu Zhou, Lei Shan, Yunxiang Lin
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Zhenglong Fan, Yixin Liu, Xinyuan Wei, Wenxiang Zhu, Hui Huang, Qi Shao, Fan Liao, Mingwang Shao, Wei Li, Gang Mu, Yang Liu, Zhenhui Kang
Summary: This study reports a large-size trigonal single-crystal rhodium oxide with strong ferromagnetism. Theoretical calculations suggest that the ferromagnetism originates from the spin splitting near the Fermi level.
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, Applied
Yixin Liu, Teng Wang, Zulei Xu, Wenshan Hong, Wei Peng, Zhi-Rong Lin, Huiqian Luo, Gang Mu
Summary: In this study, the influences of quenching treatment and cobalt-doping on the magnetic vortex dynamics of KCa2(Fe1-xCox)(4)As4F2 (x = 0, 0.1) single crystals were systematically investigated through electrical transport measurements. It was found that cobalt-doping with x = 0.1 can double the slopes of the upper critical field near T-c along both directions. The activation energy and critical current density J(c) were enhanced by the quenching treatment and could be suppressed by the introduction of cobalt-doping. Possible mechanisms for the evolutions of these important parameters were discussed. The results emphasize the important role of quenching treatment in enhancing the activation energy and critical current density in the 12442 system.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Xiaoni Wang, Lijie Wang, Yixin Liu, Fan Chen, Wanpeng Gao, Yu Wu, Zulei Xu, Wei Peng, Zhen Wang, Zengfeng Di, Wei Li, Gang Mu, Zhirong Lin
Summary: We report the observation of a robust Quantum Griffiths singularity (QGS) in NbN thin films, which is closely related to quenched disorder. The QGS shows the divergence of the dynamical critical exponent at zero temperature and can be described by activated scaling. Our experimental results show that this phenomenon can survive at higher temperatures than previously observed.
Article
Materials Science, Multidisciplinary
Mengqin Liu, Tao Han, Xinran Hu, Yubing Tu, Zongyuan Zhang, Mingsheng Long, Xingyuan Hou, Qingge Mu, Lei Shan
Summary: The study investigates the tuning of superconductivity and charge density wave in CsV3Sb5 through V kagome net doping. Ta doping promotes superconductivity but suppresses charge density wave, while Mo doping quickly suppresses superconductivity and leads to an increase in charge density wave temperature.
