Article
Physics, Multidisciplinary
Kazuki Isoyama, Naotaka Yoshikawa, Kota Katsumi, Jeremy Wong, Naoki Shikama, Yuki Sakishita, Fuyuki Nabeshima, Atsutaka Maeda, Ryo Shimano
Summary: This study demonstrates the potential of light-matter interaction as a non-thermal tuning knob to enhance emergent orders, and the non-thermal control of quantum phases. By inducing a transient enhancement of superconductivity through light in an iron chalcogenide superconductor, it validates the Higgs mode response and ultrafast dynamics of two superfluid components.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Stefano Trivini, Jon Ortuzar, Katerina Vaxevani, Jingchen Li, F. Sebastian Bergeret, Miguel A. Cazalilla, Jose Ignacio Pascual
Summary: We demonstrate that a single tunneling electron can induce pair breaking excitations in a proximitized gold film containing magnetic impurities. By combining scanning tunneling spectroscopy with theoretical modeling, we map the excitation spectrum of a Fe-porphyrin molecule on the Au/Vo100 thorn proximitized surface to a manifold of entangled Yu-Shiba-Rusinov and spin excitations. Pair excitations only emerge in the tunneling spectra as peaks outside the spectral gap in the strong coupling regime, where a bound quasiparticle in the ground state ensures the even fermion parity of the excitation. Our results unravel the quantum nature of magnetic impurities on superconductors and demonstrate that pair excitations unequivocally reveal the parity of the ground state.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Ritesh Kumar, Goutam Sheet
Summary: The paper discusses transport properties in N/S point contacts in the ballistic regime, emphasizing the impact of Andreev reflection in superconductors. It is found that even in simple and conventional superconductors, a variety of spectral features may appear in the conductance spectra depending on the shape and size of the contact.
Article
Nanoscience & Nanotechnology
Jiannan Song, Zhongtang Xu, Xuming Xiong, Wen Yuan, Chiheng Dong, Qiao Sun, Minghui Tang, Wanping Chen, Huanfang Tian, Jianqi Li, Yanwei Ma
Summary: By using interface engineering and controlling the layer thickness, high-performance FeSe0.5Te0.5 superconducting films with a thickness of up to 2 μm have been successfully prepared. The interface engineering reduces the thickness effect and improves the critical current density. The optimal film thickness is 400 nm, with a critical current density of 1.3 MA/cm² at 4.2K under self-field and 0.71 MA/cm² (H parallel to ab) and 0.50 MA/cm² (H parallel to c) at 9T.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Condensed Matter
Aastha Vasdev, Ritesh Kumar, M. K. Hooda, C. S. Yadav, Goutam Sheet
Summary: We observed the coexistence of type I and type II superconductivity in Cu-PdTe2, which can be attributed to the local variation of the Ginzburg-Landau parameter kappa in PdTe2. Cu intercalation enhances the critical temperature and alters the scattering characteristics, leading to the changes in superconducting properties.
SOLID STATE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
K. Shrestha, S. Zhang, L. H. Greene, Y. Lai, R. E. Baumbach, K. Sasmal, M. B. Maple, W. K. Park
Summary: In CeCoIn5, the local f-electron moments are directly involved in the pairing process, resulting in the emergence of a pairing gap and a field-induced gaplike feature that increases linearly with magnetic field.
Article
Chemistry, Physical
Leonid Morgun, Svetoslav Kuzmichev, Igor Morozov, Alena Degtyarenko, Andrey Sadakov, Andrey Shilov, Ilya Zhuvagin, Yevgeny Rakhmanov, Tatiana Kuzmicheva
Summary: A comprehensive study of the superconducting properties of underdoped NaFe0.979Co0.021As single crystals is presented, using a combination of upper critical field measurements and incoherent multiple Andreev reflection effect (IMARE) spectroscopy. The study reveals the temperature dependence of the Hc2(T) and the characteristics of the superconducting order parameters.
Article
Materials Science, Multidisciplinary
Khalil Zakeri, Dominik Rau, Janek Wettstein, Markus Doettling, Jasmin Jandke, Fang Yang, Wulf Wulfhekel, Joerg Schmalian
Summary: Using high-resolution electron spectroscopy, the dynamic charge response of FeSe/SrTiO3 heterostructures is studied, revealing the existence of a charge depletion layer at the interface. This depletion layer, accompanied by a significant charge transfer, results in a renormalization of SrTiO3 energy bands and substantial band bending at the interface. This discovery opens up possibilities for designing novel 2D superconductors through interface engineering, which is expected to occur at the interface of many vdW monolayers and dielectric oxides.
Article
Multidisciplinary Sciences
Saranshu Singla, Dharamdeep Jain, Chelsea M. Zoltowski, Sriharsha Voleti, Alyssa Y. Stark, Peter H. Niewiarowski, Ali Dhinojwala
Summary: This study identified the involvement of acid-base interactions between polar lipid head-groups on gecko setal surfaces and sapphire, and demonstrated the role of cohesive failure within the lipid layer in reducing setal wear during high stress sliding. Absence of the lipid layer was found to enhance adhesion, despite a small setal-substrate contact area. These results challenge the traditional view that gecko adhesion is solely based on vdW forces and is residue-free.
Article
Engineering, Environmental
Wenfeng Lu, Xiaoliang Li, Shuguang Wang, Changli Tu, Lan Qiu, Han Zhang, Chenghui Zhong, Saifeng Li, Yuewei Liu, Jing Liu, Yun Zhou
Summary: This study investigated the potential relationship between cigarette smoke and microplastic inhalation through population-based and experimental work. The findings showed that smokers had higher concentrations of microplastics in their bronchoalveolar lavage fluid samples compared to non-smokers, and the cigarette smoke in the simulated smoking model had higher concentrations of microplastics compared to the control group. These results provide new evidence on the association between cigarette smoking and microplastic inhalation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Dominik Rau, Jasmin Jandke, Fang Yang, Wulf Wulfhekel, Christophe Berthod, Khalil Zakeri
Summary: Spin-orbit coupling (SOC) is a fundamental physical interaction that describes the coupling between electron spin and orbital motion. In this study, we performed spectroscopy experiments on a FeSe monolayer on strontium titanate, a two-dimensional high-temperature superconductor, and found that the scattering cross-section is spin dependent. We showed that the SOC in this system is strong and may have important implications for the electronic structures and the mechanism of superconductivity.
Article
Physics, Applied
Zefeng Lin, Mingyang Qin, Dong Li, Peipei Shen, Liping Zhang, Zhongpei Feng, Peng Sha, Jun Miao, Jie Yuan, Xiaoli Dong, Chao Dong, Qing Qin, Kui Jin
Summary: This study successfully fabricated FeSe-coated Nb films, demonstrating the potential of using iron-based materials for multilayer structures to enhance the magnetic field performance of superconductors.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Maxim M. Korshunov, Svetoslav A. Kuzmichev, Tatiana E. Kuzmicheva
Summary: We directly observed temperature-dependent spin excitons in the Andreev spectra of iron-based superconductors. Our observation, combined with other experimental evidence, confirms the extended s-wave order parameter symmetry and indirectly supports the spin-fluctuation mechanism of Cooper pairing.
Article
Geosciences, Multidisciplinary
Federico Gasperini, McArthur Jones, Brian J. Harding, Thomas J. Immel
Summary: Sudden stratospheric warmings (SSWs) are large-scale phenomena characterized by dramatic dynamic disruptions in the stratospheric winter polar regions. This study presents observational evidence of a prominent mesosphere lower thermosphere (MLT) mean meridional circulation (MMC) reversal associated with the 2021 January major SSW event using horizontal MLT winds observations. The study also explores the connections between the MLT MMC reversal and semidiurnal tidal activity, as well as a possible association with a 3-day ultra-fast Kelvin wave.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Shaozhu Xiao, Meng Liu, Linfei Li, Jiatao Sun, Yeliang Wang, Shaolong He
Summary: The electronic structure of hafnene grown on the Ir(111) substrate was investigated, revealing a simple band structure and the presence of a 2D electron gas.
Article
Physics, Applied
Y. A. Ovchenkov, D. A. Chareev, D. E. Presnov, O. S. Volkova, A. N. Vasiliev
Summary: In this study, the transport properties of FeSe1-xTex and pure FeSe crystals were compared. The results showed significant differences in structural transitions and temperature dependence between the two, suggesting a change in the ground state and the presence of quantum criticality. Furthermore, the phase diagram of FeSe1-xTex at low x resembled that of FeSe under pressure.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Correction
Chemistry, Multidisciplinary
Dmitriy A. A. Chareev, Md Ezaz Hasan Khan, Debjani Karmakar, Aleksey N. N. Nekrasov, Maximilian S. S. Nickolsky, Olle Eriksson, Anna Delin, Alexander N. N. Vasiliev, Mahmoud Abdel-Hafiez
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Dmitriy A. Chareev, Md Ezaz Hasan Khan, Debjani Karmakar, Aleksey N. Nekrasov, Maximilian S. Nickolsky, Olle Eriksson, Anna Delin, Alexander N. Vasiliev, Mahmoud Abdel-Hafiez
Summary: Transition metal dichalcogenides (TMDs) are a class of low-dimensional materials with growing applications in nanoelectronics. This study presents an efficient synthetic route for a large number of TMDs using sulfuric vapor transport and liquid sulfur. The obtained single crystals exhibit high-quality physical and electronic properties, making them suitable for emerging electronic devices.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Geology
E. F. Bazarkina, A. V. Zotov, D. A. Chareev, L. Truche, M. E. Tarnopolskaya
Summary: The present experimental study investigates the effects of temperature and sulfur on the geochemistry of Cd in aqueous solutions under reduced conditions. The solubility of CdS is measured in solutions containing H2O-H2S-HClO4-NaHS at temperatures ranging from 25 to 80°C, and as a function of pH and sulfur concentration. The results show that the stability of CdS is higher than previously predicted, and the Cd-HS complexes are more important than previously believed. The speciation change from Cd-Cl to Cd-HS is expected to have implications for Cd isotope fractionation in marine sediments.
GEOLOGY OF ORE DEPOSITS
(2023)
Article
Physics, Multidisciplinary
M. V. Golubkov, V. A. Stepanov, A. V. Sadakov, A. S. Usol'tsev, I. V. Morozov
Summary: The characteristics of point Josephson contacts Pb0.6In0.4/KFe2As2 and KFe2As2/KFe2As2 were studied. The temperature dependence of characteristic contact voltages V-C(T) and the dependence of the first current step amplitudes in I-V characteristics on the power of 7.6-GHz electromagnetic radiation were measured. It was found that V-C(T) curves for all contacts can be described in terms of the SIS*IS contact model for superconductors with the s-symmetry of order parameter. It was also proven that the current step oscillation period as a function of microwave power can be approximated with the resistive model of contact with I-S = I(C)sin(phi). The obtained data are consistent with the normal s-symmetry of order parameter.
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Evgeny A. Gorbachev, Miroslav V. Soshnikov, Liudmila N. Alyabyeva, Ekaterina S. Kozlyakova, Anastasia S. Fortuna, Asmaa Ahmed, Roman D. Svetogorov, Lev A. Trusov
Summary: The development of ultrafast electronics requires materials with high-frequency spin dynamics. Insulators with magnetic anisotropy and magnetization precession phenomenon offer potential for breakthroughs in this field. A study investigated a hard ferrimagnetic insulator (cobalt ferrite CoFe2O4) and found that it demonstrated resonance absorption at frequencies higher than 0.20 THz. The study also developed a model to explain the magnetodynamic properties and discussed the potential practical applications in ultrafast electronics.
Article
Chemistry, Physical
Artem Moskin, Ekaterina Kozlyakova, Seung Hwan Chung, Hyun-Joo Koo, Myung-Hwan Whangbo, Alexander Vasiliev
Summary: We determined the key parameters governing the magnetic structure of the mixed-valent Ba2Mn2+Mn23+(SeO3)(6) compound through magnetization and specific heat measurements. The compound exhibits short-range correlation order at 10.1 K and long-range Neel order at 5.7 K, with a metamagnetic phase transition at T < T-N. Density functional theory calculations were used to evaluate the spin exchange parameters and explain these observations.
Article
Geosciences, Multidisciplinary
Boris R. Tagirov, Olga N. Filimonova, Alexander L. Trigub, Ilya V. Vikentyev, Elena Kovalchuk, Maximilian S. Nickolsky, Andrey A. Shiryaev, Vladimir L. Reukov, Dmitry A. Chareev
Summary: Chalcopyrite and bornite are the main Au-bearing minerals found in various types of deposits. The distribution and state of gold in these minerals, specifically in bnss and iss, have been studied using in situ X-ray absorption spectroscopy (XAS).
GEOSCIENCE FRONTIERS
(2023)
Article
Physics, Multidisciplinary
T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov, V. A. Vlasenko
Summary: We compare the structure of superconducting order parameter of overdoped BaFe1.88Ni0.12As2 and underdoped BaFe1.92Ni0.08As2 pnictides with similar T-c around 18.0-18.3 K. Using spectroscopy, we directly determine the magnitudes of the two microscopic superconducting order parameters and discuss their similarity, difference, and possible influence of antiferromagnetic phase on superconducting properties.
Article
Engineering, Chemical
L. Babedi, M. Tadie, B. P. von der Heyden, D. A. Chareev
Summary: Pyrite is an important component of sulphide ore deposits and its separation is a crucial step in ore processing. This study investigates the reactivity of synthetic trace-element substituted pyrite samples under industrial flotation conditions. The results show that the presence of impurities affects oxidation and hydrophobicity, and the degree of oxidation is linearly correlated with the concentration of each substituent. Understanding the impacts of substitution mechanisms on the surface reactivity and flotability of pyrite is important for improving separation methods.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Physical
Leonid Morgun, Svetoslav Kuzmichev, Igor Morozov, Alena Degtyarenko, Andrey Sadakov, Andrey Shilov, Ilya Zhuvagin, Yevgeny Rakhmanov, Tatiana Kuzmicheva
Summary: A comprehensive study of the superconducting properties of underdoped NaFe0.979Co0.021As single crystals is presented, using a combination of upper critical field measurements and incoherent multiple Andreev reflection effect (IMARE) spectroscopy. The study reveals the temperature dependence of the Hc2(T) and the characteristics of the superconducting order parameters.
Article
Chemistry, Multidisciplinary
Ivan A. Troyan, Dmitrii V. Semenok, Anna G. Ivanova, Andrey V. Sadakov, Di Zhou, Alexander G. Kvashnin, Ivan A. Kruglov, Oleg A. Sobolevskiy, Marianna V. Lyubutina, Dmitry S. Perekalin, Toni Helm, Stanley W. Tozer, Maxim Bykov, Alexander F. Goncharov, Vladimir M. Pudalov, Igor S. Lyubutin
Summary: The chemical interaction of Sn with H-2 was studied using X-ray diffraction methods, revealing the superconducting properties and structure of SnH4 tetrahydride, as well as several lower hydrides. SnH4 showed unusual behavior in strong magnetic fields and its electrical resistance temperature dependence did not follow conventional theories. These findings suggest that superhydrides are more similar to cuprates than previously believed.
Article
Chemistry, Multidisciplinary
Evgeny A. Gorbachev, Ekaterina S. Kozlyakova, Liudmila N. Alyabyeva, Asmaa Ahmed, Lev A. Trusov
Summary: The temperature behavior of the magnetic properties and natural ferromagnetic resonance has been studied for single-domain Sr1-x/12Cax/12Fe12-xAlxO19 (x = 1.5-5.5) particles. It is found that the samples exhibit giant room temperature coercivities (20-36 kOe) and sub-terahertz NFMR frequencies (160-250 GHz) due to high aluminum substitution in M-type hexaferrites. Moreover, the coercivity and NFMR frequencies show a maximum shifting to the low-temperature region with an increase in aluminum concentration, with the highest values observed for x = 5.5 at 180 K.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Physical
A. A. Gippius, A. V. Gunbin, A. V. Tkachev, S. V. Zhurenko, D. I. Fazlizhanova, S. A. Kuzmichev, T. E. Kuzmicheva, V. Yu Verchenko, A. V. Shevelkov
Summary: A comprehensive study of the intermetallic superconductor Mo8Ga41 reveals the presence of an inherent surface superconducting phase in addition to the bulk superconducting phase. The s-wave type single-gap superconducting behavior with enhanced electron-phonon coupling is observed in the bulk phase. The surface phase shows a lower superconducting gap value, indicating a weak-coupling BCS limit. These findings help explain the multi-gap behavior in Mo8Ga41.
