Article
Chemistry, Multidisciplinary
Vasily S. Stolyarov, Vsevolod Ruzhitskiy, Razmik A. Hovhannisyan, Sergey Grebenchuk, Andrey G. Shishkin, Olga V. Skryabina, Igor A. Golovchanskiy, Alexander A. Golubov, Nikolay V. Klenov, Igor I. Soloviev, Mikhail Yu. Kupriyanov, Alexander Andriyash, Dimitri Roditchev
Summary: SNS Josephson junctions, made of a thin non-superconducting metal sandwiched by two superconductors, enable novel quantum functionalities by mixing the intrinsic electronic properties of the metal with the superconducting correlations induced by proximity. The electronic properties of these devices are governed by Andreev quasiparticles, which are absent in conventional junctions. In Nb-Cu-Nb proximity junctions, the motion of Josephson vortices under electric currents and magnetic fields exhibits distinct dynamic regimes.
Article
Chemistry, Multidisciplinary
Razmik A. Hovhannisyan, Olena M. Kapran, Taras Golod, Vladimir M. Krasnov
Summary: In this research, it is demonstrated theoretically and experimentally that the Josephson critical current Ic can be accurately extracted using first and third harmonic lock-in measurements of junction resistance. Analytical expressions were derived and experimentally verified on nano-scale Nb-PtNi-Nb and Nb-CuNi-Nb Josephson junctions.
Article
Materials Science, Multidisciplinary
A. Rozhkov, Tony Liu, A. Andreev, B. Z. Spivak
Summary: This study theoretically investigates the critical current characteristics of a Josephson junction formed by a one-dimensional conductor connecting two superconducting leads, revealing that in the clean regime, the sign of the critical current alternates with the number of electrons in the normal region.
Article
Materials Science, Multidisciplinary
Chun-Xiao Liu, Bernard van Heck, Michael Wimmer
Summary: The study reveals that the contribution of Majorana to the supercurrent can be activated when time-reversal symmetry in the conventional lead is broken. Moreover, there will be a Majorana-induced anomalous supercurrent when the magnetic field has a component in the direction of the effective spin-orbit field. These findings highlight the characteristic behaviors of Majorana zero modes that can be accessed with devices having only superconducting contacts.
Article
Materials Science, Multidisciplinary
Hao Meng, Xiuqiang Wu, Yajie Ren, Jiansheng Wu
Summary: The study shows that the critical current oscillates with the exchange field and thickness of the ferromagnets when their magnetizations are antiparallel, while the critical current reaches a larger value and is hardly affected by other parameters when the magnetization at the central interface is perpendicular to that at the left and right interfaces.
Article
Materials Science, Multidisciplinary
Stefan Backens, Alexander Shnirman
Summary: The study highlights the importance of considering both scattering modes and localized states in determining the current-phase relation of topological Josephson junctions. The analysis also examines the dependence of Josephson current on the thickness of the junction and deviations from the sinusoidal shape of the current-phase relation.
Article
Chemistry, Physical
Jose Samuel Millan, Jorge Millan, Luis A. Perez, Harold S. Ruiz
Summary: This work applies the Generalized Hubbard Model to evaluate the electrical current density of d-wave superconductors with high critical temperatures. The model provides a good quantitative fit with important macroscopic superconducting properties. The study suggests that the electron velocity in the superconducting state is proportional to the gradient of the dispersion relation, taking into account changes in the electron density of states and the formation of energy gaps. The d-wave symmetry of the pairing interaction leads to a maximum critical current density in certain k-space directions.
Article
Chemistry, Multidisciplinary
Martin Endres, Artem Kononov, Hasitha Suriya Arachchige, Jiaqiang Yan, David Mandrus, Kenji Watanabe, Takashi Taniguchi, Christian Schoenenberger
Summary: In this study, we measured a 4N-periodic switching current through an asymmetric SQUID formed by the higher-order topological insulator WTe2. We found that a high asymmetry in critical current and negligible loop inductance alone were not sufficient to reliably measure the current-phase relation. Instead, we discovered that our measurement was heavily influenced by additional inductances originating from the self-formed PdTex inside the junction. We developed a method to numerically recover the current-phase relation and found that the 1.5 μm long junction was best described in the short ballistic limit. Our results highlight the complexity of subtle inductance effects that can lead to misleading topological signatures in transport measurements.
Article
Materials Science, Ceramics
M. Giebultowski, R. Zalecki, M. Rajska, W. Tokarz, J. M. Michalik, M. Kowalik, L. Gondek, W. M. Woch
Summary: This study demonstrates that thallium-based cuprates can exhibit high critical temperatures by partially substituting copper with transition elements.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Yu. Zh. Tuleushev, V. N. Volodin, E. A. Zhakanbayev, I. D. Gorlachyov, E. E. Suslov
Summary: The article provides a detailed description of the features used in the experimental setup capable of producing intermetallic compound Nb3Ge coatings on a long copper tape. The structure of the formed coatings has been studied and the critical transition temperature has been determined. The results show the stability of the proposed technology in relation to harmful factors such as the insufficient purity of the feedstock and presence of oil vapor in the vacuum.
Article
Multidisciplinary Sciences
Mohammad T. Haque, Marco Will, Matti Tomi, Preeti Pandey, Manohar Kumar, Felix Schmidt, Kenji Watanabe, Takashi Taniguchi, Romain Danneau, Gary Steele, Pertti Hakonen
Summary: The study focused on 1/f noise in critical current Ic in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes, finding fluctuations on the order of 10^(-3) and obeying a power law in the noise power spectrum. The results suggest significant fluctuations in Ic arising from variation of the proximity induced gap in the graphene junction.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
A. L. Graninger, C. A. Watson, R. E. Zimmerman, W. F. Koehl, D. R. Johnson, R. Shiskowski, M. Rennie, M. Lilly
Summary: The study demonstrates that redundant via placement in superconductor-insulator-superconductor Josephson junctions can lead to unconventional features in Fraunhofer interference patterns, highlighting the significant role of contact vias on thin counter electrodes in the response of Josephson junctions to applied magnetic fields.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Materials Science, Multidisciplinary
Xinyou Liu, Wei Zhang, Kwing To Lai, K. Moriyama, J. L. Tallon, K. Yoshimura, Swee K. Goh
Summary: (CaxSr1-x)(3)Rh4Sn13 is a rare system that shows an interesting interplay between structural quantum criticality and superconductivity. By studying the critical current density, it has been found that the critical current density at zero temperature is significantly enhanced near the structural quantum critical point.
Article
Chemistry, Multidisciplinary
Yiteng Xing, Pierre Bernstein, Muralidhar Miryala, Jacques G. Noudem
Summary: In this study, in situ MgB2 superconducting samples were prepared using the spark plasma sintering method. The samples exhibited high critical current densities and strong vortex pinning ability, which can be attributed to the sample density and the presence of MgB2 nanograins in connection to MgO precipitates and areas rich in boron.
Article
Physics, Multidisciplinary
Probhu Mandal, Doyel Rakshit, Ipsita Mukherjee, Tasaul Sk, Ajay Kumar Ghosh
Summary: The current-voltage characteristics of REBa2Cu3O7-delta are used to study the interlayer coupling and vortex pinning effects induced by distributed magnetic moments. The critical current density and its variations are analyzed to understand the nature of vortex pinning in different grain boundary angles.
