Zobrazeno 1 - 10 of 28 pro vyhledávání: '"V G, Kogan"'
1
Effects of scattering on the field-induced Tc enhancement in thin superconducting films in a parallel magnetic field
Autor: V. G. Kogan, R. Prozorov
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: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74ef3e9274a98b88778dfdb2f7732682
http://arxiv.org/abs/2209.12115
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3
Multiband superconductivity in V 3 Si determined from studying the response to controlled disorder
Autor: Kyuil Cho, M. Kończykowski, S. Ghimire, M. A. Tanatar, Lin-Lin Wang, V. G. Kogan, R. Prozorov
Publikováno v: Physical Review B
Physical Review B, 2022, 105 (2), pp.024506. ⟨10.1103/PhysRevB.105.024506⟩
International audience; The London penetration depth λ(T) was measured in a single crystal of V3Si. The superfluid density obtained from this measurement shows a distinct signature of two almost decoupled superconducting gaps. This alone is insuffic
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d615a78fb1807802852dd8fa5f42a459
https://hal.science/hal-03798647
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4
Critical fields of superconductors with magnetic impurities
Autor: V. G. Kogan, R. Prozorov
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: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a75fed7896cac27c2f418ba84106d534
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5
Nonexponential London penetration depth of FeAs-based superconducting RFeAsO(0.9)F(0.1) (R = La, Nd) single crystals
Autor: C, Martin, M E, Tillman, H, Kim, M A, Tanatar, S K, Kim, A, Kreyssig, R T, Gordon, M D, Vannette, S, Nandi, V G, Kogan, S L, Bud'ko, P C, Canfield, A I, Goldman, R, Prozorov
Publikováno v: Physical review letters. 102(24)
The superconducting penetration depth lambda(T) has been measured in RFeAsO(0.9)F(0.1) (R = La, Nd) single crystals (R-1111). In Nd-1111, we find an upturn in lambda(T) upon cooling and attribute it to the paramagnetism of the Nd ions, similar to the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::d34dd676038d3391806eae04ac529260
https://pubmed.ncbi.nlm.nih.gov/19659038
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6
Free energy and torque for superconductors with different anisotropies of H(c2) and lambda
Autor: V G, Kogan
Publikováno v: Physical review letters. 89(23)
The free energy is evaluated for a uniaxial superconductor with the anisotropy of the upper critical field, gamma(H)=H(c2,a)/H(c2,c), different from the anisotropy of the penetration depth gamma(lambda)=lambda(c)/lambda(a). With increasing difference
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::64588ad34d556ad21cf65393fdaad4b4
https://pubmed.ncbi.nlm.nih.gov/12485033
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7
Nucleation of superconductivity in finite anisotropic superconductors and the evolution of surface superconductivity toward the bulk mixed state
Autor: Max D. Gunzburger, Jennifer Deang, V. G. Kogan, J. R. Clem
Publikováno v: Physical Review B. 65
In anisotropic superconductors having an arbitrary orientation of the sample surface relative to the crystal principal axes, the surface critical field H c 3 is less than 1.695H c 2 unless the field is situated along one of the principal crystal plan
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::58cd15a7dabd0cd10df29695ec219b51
https://doi.org/10.1103/physrevb.65.094514
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8
Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data
Autor: F, Simon, A, Jánossy, T, Fehér, F, Murányi, S, Garaj, L, Forró, C, Petrovic, S L, Bud'ko, G, Lapertot, V G, Kogan, P C, Canfield
Publikováno v: Physical review letters. 87(4)
We observed the conduction electron spin resonance (CESR) in fine powders of MgB2 both in the superconducting and normal states. The Pauli susceptibility is chi(s) = 2.0 x 10(-5) emu/mole in the temperature range of 450 to 600 K. The spin relaxation
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::22715e67d51da2e48a44a8233288c2a0
https://pubmed.ncbi.nlm.nih.gov/11461637
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9
On the Born approximation for weak uniform scatterers
Autor: E F Lopes, V G Kogan
Publikováno v: Inverse Problems. 1:331-338
It is shown that reconstruction of the shape of a weak uniform scatterer does not require the full three-dimensional (3D) set of scattering data. The Fourier transform gamma (q) of the characteristic function gamma (r) (equal to unity inside the flaw
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f613db4e976af444a624a2b259ceb62c
https://doi.org/10.1088/0266-5611/1/4/005
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10
A Generalization of Abrikosov's solution of the Ginzburg-Landau equations
Autor: V. G. Kogan
Publikováno v: Journal of Low Temperature Physics. 20:103-115
The Ginzburg-Landau (GL) equations for type II superconductors near the upper critical field H c2 permit a more general solution than Abrikosov's.1 It turns out that already in the first approximation it is possible to build the solution for H < H c2
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3a78d951ccbb72ce97b47714fbe0aff7
https://doi.org/10.1007/bf00115258
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