Zobrazeno 1 - 10
of 968
pro vyhledávání: '"Kogan, V. A."'
Autor:
Nakagawa, N., Kogan, V. G.
The currents and field distributions of a vortex in a thin superconducting strip of a width $W$ is considered. It is shown that unlike infinite films where the vortex field crosses the film only in one direction (say, from the half-space under the fi
Externí odkaz:
http://arxiv.org/abs/2310.01722
Publikováno v:
Phys. Rev. B 109, 024506 (2024)
A recent theory of the disorder-dependent slope of the upper critical field, $H_{c2}$, at the superconducting transition temperature, $T_{c}$, is extended to multiband superconductors aiming at iron-based superconductors, considering two constant gap
Externí odkaz:
http://arxiv.org/abs/2306.08703
Autor:
Kogan, V. G., Prozorov, R.
Publikováno v:
Phys. Rev. B 108, 064502 (2023)
We study the slopes of the upper critical field $\partial_{T}H_{c2}|_{T_{c}}\equiv\partial H_{_{c2}}/\partial T$ at $T_{c}$ in anisotropic superconductors with transport (non-magnetic) scattering employing the Ginzburg-Landau theory, developed for th
Externí odkaz:
http://arxiv.org/abs/2306.00259
Autor:
Kogan, V. G., Prozorov, R.
Publikováno v:
Phys. Rev. B (letter) 107, L020501 (2023)
The problem of a thin superconducting film in a parallel magnetic field, first discussed in the classical paper by Ginzburg and Landau for temperatures close to the critical, is revisited with the help of the microscopic BCS theory for arbitrary temp
Externí odkaz:
http://arxiv.org/abs/2209.12115
Autor:
Kogan, V. G., Prozorov, R.
Publikováno v:
Phys. Rev. B 106, 054505 (2022)
The upper critical field $H_{c2} $, the field $H_{c3}$ for nucleation of the surface superconductivity, and the thermodynamic $H_c $ are evaluated within the weak-coupling theory for the isotropic s-wave case and arbitrary transport and pair-breaking
Externí odkaz:
http://arxiv.org/abs/2206.12462
Autor:
Xu, M., Schmidt, J., Gati, E., Xiang, L., Meier, W. R., Kogan, V. G., Bud'ko, S. L., Canfield, P. C.
Publikováno v:
Phys. Rev. B 105, 214526 (2022)
Members of the CaK(Fe$_{1-x}$Mn$_{x}$)$_{4}$As$_{4}$ series have been synthesized in single crystalline form and characterized by elemental analysis, thermodynamic and transport measurements. These measurements show that the superconducting transitio
Externí odkaz:
http://arxiv.org/abs/2204.10925
Autor:
Kogan, V. G., Nakagawa, N.
Moving vortices in thin superconducting films are considered within the time-dependent London description. The dissipation due to out-of-core normal excitations for two vortices moving together turns out to have a minimum for the separation vector $\
Externí odkaz:
http://arxiv.org/abs/2111.01741
Autor:
Cho, Kyuil, Kończykowski, M., Ghimire, S., Tanatar, M. A., Wang, Lin-Lin, Kogan, V. G., Prozorov, R.
Publikováno v:
Physical Review B 105, 024506 (2022)
The London penetration depth, $\lambda(T)$, was measured in a single crystal V$_{3}$Si. The superfluid density obtained from this measurement shows a distinct signature of two almost decoupled superconducting gaps. This alone is insufficient to disti
Externí odkaz:
http://arxiv.org/abs/2109.12446
The magnetic field of vortices in anisotropic superconducting films is considered in the framework of anisotropic London approach. It is found that at distances large relative to the core size, the magnetic field normal to the film surface may change
Externí odkaz:
http://arxiv.org/abs/2109.01966
Autor:
Kogan, V. G., Nakagawa, N.
Publikováno v:
Phys. Rev. B 104, 094523 (2021)
The magnetic field of moving vortices in anisotropic superconductors is considered in the framework of time-dependent London approach. It is found that at distances large relative to the core size, the field may change sign that alludes to a non-triv
Externí odkaz:
http://arxiv.org/abs/2107.11469