Article
Multidisciplinary Sciences
Kohei Matsuura, Masaki Roppongi, Mingwei Qiu, Qi Sheng, Yipeng Cai, Kohtaro Yamakawa, Zurab Guguchia, Ryan P. Day, Kenji M. Kojima, Andrea Damascelli, Yuichi Sugimura, Mikihiko Saito, Takaaki Takenaka, Kota Ishihara, Yuta Mizukami, Kenichiro Hashimoto, Yilun Gu, Shengli Guo, Licheng Fu, Zheneng Zhang, Fanlong Ning, Guoqiang Zhao, Guangyang Dai, Changqing Jin, James W. Beare, Graeme M. Luke, Yasutomo J. Uemura, Takasada Shibauchi
Summary: Iron-chalcogenide superconductors FeSe1-xSx have unique electronic properties and the nature of superconductivity with nematicity is important for understanding unconventional superconductivity. Recent experiments show that the superconducting state in FeSe1-xSx breaks time-reversal symmetry and exhibits ultranodal pair state. The presence of broken TRS and suppressed superfluid density suggests the existence of two different superconducting states separated by the nematic critical point.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Ya-Bin Liu, Yi Liu, Yan-Wei Cui, Si-Qi Wu, Zhi Ren, Guang-Han Cao
Summary: This study investigates the effects of Ni doping on the magnetism and superconductivity in the Eu-containing 112-type system Eu(Fe1-xNix)As-2. The results show that Ni doping suppresses the spin-density wave order and induces superconductivity within a certain range, indicating a weak coupling between superconductivity and Eu spins.
Article
Chemistry, Physical
Vladimir A. Kulbachinskii, Yan Zubavichus, Roman D. Svetogorov, Nikolai S. Ezhikov, Roman A. Lunin, Boris M. Bulychev
Summary: The synthesis of triammonium fulleride by ion exchange, the crystal structure similarities between (NH4)(3)C-60 and K3C60, as well as the tendency of ammonium and potassium to form solid solutions in the fulleride phase were investigated. The superconductivity of (NH4)(3)C-60-related phases was also confirmed with similar transition temperatures around 16.4 K.
Article
Chemistry, Multidisciplinary
Hideki Narita, Jun Ishizuka, Daisuke Kan, Yuichi Shimakawa, Youichi Yanase, Teruo Ono
Summary: The superconducting diode effect (SDE) has great potential for developing ultralow power consumption circuits and non-volatile memory. However, controlling the SDE requires precise tuning of current, temperature, magnetic field, or magnetism. This study demonstrates a zero-field SDE with an efficiency of up to 40% in Fe/Pt-inserted non-centrosymmetric Nb/V/Ta superconducting artificial superlattices. The polarity and magnitude of the zero-field SDE are controllable by magnetization direction, indicating the influence of the effective exchange field on Cooper pairs.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
K. P. Sajilesh, R. P. Singh
Summary: Ternary noncentrosymmetric superconductors TaXSi (X = Re, Ru) were investigated by magnetization, resistivity, and specific heat measurements. They crystallize in the orthorhombic TiFeSi-type structure and exhibit superconducting transition temperatures of 5.32 K and 3.91 K for TaReSi and TaRuSi, respectively. The low specific heat jump and concave nature of the upper critical field suggest a nontrivial superconducting gap.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Rebecca Cervasio, Luca Tomarchio, Marine Verseils, Jean-Blaise Brubach, Salvatore Macis, Shengwei Zeng, Ariando Ariando, Pascale Roy, Stefano Lupi
Summary: The recent discovery of superconductivity in infinite-layer nickelates is expected to help solve the puzzle of high Tc values in oxides. In this study, the optical properties of a Nd0.8Sr0.2NiO2 film were measured using optical and terahertz spectroscopy above and below the critical temperature. The results show the presence of a superconducting energy gap below Tc.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
A. B. Yu, Z. Huang, C. Zhang, Y. F. Wu, T. Wang, T. Xie, C. Liu, H. Li, W. Peng, H. Q. Luo, G. Mu, H. Xiao, L. X. You, T. Hu
Summary: The study experimentally investigated the vortex pinning in two bilayer FeSCs, CaKFe4As4(Fe1144) and KCa2Fe4As4F2(Fe12442), revealing a higher flux pinning energy in Fe1144. By combining data from other FeSCs, an anti-correlation was found between the pinning energy and superconducting anisotropy in these materials, indicating the importance of interlayer interaction when considering vortex pinning in FeSCs.
Article
Materials Science, Multidisciplinary
Giulia Venditti, Marco Grilli, Sergio Caprara
Summary: LaAlO3/SrTiO3 interfaces are two-dimensional electron gases that can have their carrier density controlled to alter their electrical properties. These interfaces have complex band structures and exhibit superconductivity. Understanding the finite-bandwidth effects of these interfaces is important, especially in studying the critical temperature of heavily disordered multi-gap superconductors.
Article
Chemistry, Physical
M. F. Hansen, J. -B. Vaney, P. De Rango, M. Salaun, S. Tence, V. Nassif, P. Toulemonde
Summary: In this study, the topotactical deuteration of LaFeSi into superconducting LaFeSi(H,D) was investigated using in-situ neutron powder diffraction. The thermodynamic nature of the chemical process was studied through thermogravimetric analysis, differential thermal analysis, and mass spectroscopy. Pressure-composition-isotherm measurements revealed a remarkably low equilibrium pressure. The reaction enthalpy was determined to be Delta H = -54.5 kJ/mol. The obtained LaFeSi(H,D) samples exhibited a significant change in thermal expansion anisotropy, and all showed superconductivity with a transition temperature of -10 K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov, V. A. Vlasenko
Summary: By studying the superconductor-normal metal-superconductor contacts in overdoped BaFe1.86Ni0.14As2 superconductors, an anisotropic large gap and an almost isotropic small gap with their temperature dependencies were directly determined. Additionally, a fine structure in dI(V)/dV possibly caused by resonant coupling with a bosonic mode above the large gap position was observed and fully vanished at Tc.
Article
Physics, Multidisciplinary
Yong Li, Weizheng Liang, Ning Li, Yongliang Chen, S. N. Luo, Yong Zhao
Summary: The coexistence of the anomalous pseudogap and superconducting states in underdoped Bi2Sr2CaCu2O8+delta at temperatures below the superconducting transition temperature was investigated using femtosecond transient optical spectroscopy. The results suggest that the pseudogap state above the superconducting transition temperature can be explained as a condensation of Cooper pairs with short coherence length.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Applied
He Huang, Chao Yao, Chiheng Dong, Xianping Zhang, Dongliang Wang, Shifa Liu, Zhe Cheng, Yanchang Zhu, Yanwei Ma
Summary: Using the EBSD technique, the microstructure of hot-pressed (HP) and flat-rolled (FR) Ba-122 tapes was analyzed. The results indicated that HP tapes exhibited better texture and grain connectivity, while FR tapes had smaller grain size. It is recommended to find a balance point that promotes grain orientation and maintains moderate grain size to improve the transport properties of IBS tapes further.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Anna Krzton-Maziopa
Summary: Intercalated layered iron-based monochalcogenides with organic molecules show potential for fine-tuning their magnetic and electrical properties by controlling doping and organic molecule characteristics. Recent progress in intercalation chemistry has led to the discovery of new hybrid inorganic-organic phases with high superconducting transition temperatures.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
Stanislav I. Bondarenko, Anatolij I. Prokhvatilov, Roman Puzniak, Jaroslaw Pietosa, Andrey A. Prokhorov, Vladimir V. Meleshko, Valeriy P. Timofeev, Valentin P. Koverya, Dariusz Jakub Gawryluk, Andrzej Wisniewski
Summary: Hydrogenation significantly modified the properties of FeTe0.65Se0.35 single crystals, leading to an increase in critical temperature and critical current density. The structural changes induced by hydrogen diffusion affected the superconducting properties of the crystals.
Review
Physics, Multidisciplinary
Rong Yu, Haoyu Hu, Emilian M. Nica, Jian-Xin Zhu, Qimiao Si
Summary: Electron correlations play a central role in iron-based superconductors, especially in the normal state and superconducting state with electron filling n similar to 6. The interplay between orbital-selective correlations and electronic nematicity is a key focus of study.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
T. E. Kuzmicheva, S. A. Kuzmichev, A. A. Kordyuk, V. M. Pudalov
Review
Physics, Applied
A. A. Kordyuk
LOW TEMPERATURE PHYSICS
(2018)
Article
Physics, Applied
V. E. Shaternik, A. P. Shapovalov, O. Yu. Suvorov, E. S. Zhitlukhina, M. A. Belogolovskii, P. Febvre, A. A. Kordyuk
LOW TEMPERATURE PHYSICS
(2018)
Article
Physics, Multidisciplinary
A. A. Kalenyuk, A. Pagliero, E. A. Borodianskyi, A. A. Kordyuk, V. M. Krasnov
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Applied
Yu. V. Toporov, A. A. Kordyuk
LOW TEMPERATURE PHYSICS
(2019)
Editorial Material
Physics, Applied
Yu. G. Naidyuk, A. A. Kordyuk
LOW TEMPERATURE PHYSICS
(2019)
Article
Physics, Applied
Yu. V. Pustovit, A. A. Kordyuk
LOW TEMPERATURE PHYSICS
(2019)
Article
Physics, Applied
V Tarenkov, A. Shapovalov, O. Boliasova, M. Belogolovskii, A. Kordyuk
Summary: This study demonstrates the presence of two energy gaps in Mo-Re alloy, indicating its potential for implementing new quantum effects.
LOW TEMPERATURE PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
A. P. Shapovalov, M. O. Belogolovskii, O. O. Boliasova, O. A. Kordyuk
Summary: This review article summarizes recent progress in low-temperature properties of binary molybdenum-based alloys and intermetallic compounds, focusing mainly on superconductivity characteristics reflecting novel physics as well as possible applications. Experimental data proving two-band/two-gap nature of some superconducting compounds are presented, with a discussion on the impact of noncentrosymmetrical structures on superconducting pairing properties of related compounds.
USPEKHI FIZIKI METALLOV-PROGRESS IN PHYSICS OF METALS
(2021)
Article
Physics, Applied
A. M. Kutsyk, A. L. Kasatkin, A. A. Kordyuk
Summary: The entry and dynamics of fractional vortices inside a two-band superconductor were investigated using numerical solutions of time-dependent Ginzburg-Landau equations. It was found that different types of fractional vortices penetrate the specimen in different ways as the external magnetic field increases. This behavior was attributed to differences in the parameters characterizing the superfluid electron condensates from two zones.
LOW TEMPERATURE PHYSICS
(2021)
Article
Multidisciplinary Sciences
Sergey Borisenko, Alexander Fedorov, Andrii Kuibarov, Marco Bianchi, Volodymyr Bezguba, Paulina Majchrzak, Philip Hofmann, Peter Baumgaertel, Vladimir Voroshnin, Yevhen Kushnirenko, Jaime Sanchez-Barriga, Andrei Varykhalov, Ruslan Ovsyannikov, Igor Morozov, Saicharan Aswartham, Oleh Feia, Luminita Harnagea, Sabine Wurmehl, Alexander Kordyuk, Alexander Yaresko, Helmuth Berger, Bernd Buechner
Summary: Fermi surfaces are crucial for understanding the properties of crystalline metals and semiconductors. A new angle-resolved photoemission spectroscopy technique is presented that allows for fast and high-resolution mapping of the Fermi surface.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
A. Kuibarov, A. Fedorov, V. Bezguba, H. Berger, A. Yaresko, V. Voroshnin, A. Kordyuk, P. Baumgaertel, B. Buechner, S. Borisenko
Summary: Using angle-resolved photoemission spectroscopy, this study revisits the electronic structure of BiTeI and proposes an alternative description based on the experimentally determined crystal structure. The results show that BiTeI is a topological 3D Dirac semimetal with only two, well isolated Dirac points in its band structure.
Article
Materials Science, Multidisciplinary
A. A. Kalenyuk, E. A. Borodianskyi, A. A. Kordyuk, V. M. Krasnov
Summary: The study reveals that inserting a copper interlayer in hybrid Josephson junctions between multiband iron-pnictide and Nb can significantly enhance the IcRn product, despite the weaker proximity-induced superconductivity of copper. This counterintuitive phenomenon is attributed to the differences in Fermi surface geometries of Nb and Cu, affecting the tunneling selectivity in sign-reversal s(+/-) bands of pnictide. The results suggest that the sensitivity to Fermi surface geometries provides a new tool for phase-sensitive studies and enables conscious Fermi surface engineering of pnictide junctions.
Article
Materials Science, Multidisciplinary
A. P. Shapovalov, P. Febvre, U. Yilmaz, V. Shnyrkov, M. O. Belogolovskii, O. A. Kordyuk
USPEKHI FIZIKI METALLOV-PROGRESS IN PHYSICS OF METALS
(2020)
Article
Materials Science, Multidisciplinary
Yu. V. Pustovit, O. A. Kordyuk
USPEKHI FIZIKI METALLOV-PROGRESS IN PHYSICS OF METALS
(2017)