Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Kogan, Vladimir G."'
Autor:
Prozorov, Ruslan, Kogan, Vladimir G.
The simplified scaling of the orbital upper critical field, $H_{c2}(T)$, for the isotropic case is discussed. To facilitate the analysis of the experimental data, we suggest a simple but accurate approximation in the entire temperature range of the s
Externí odkaz:
http://arxiv.org/abs/2407.15000
Autor:
Khasanov, Rustem, Simutis, Gediminas, Pashkevich, Yurii G., Shevtsova, Tatyana, Meier, William R., Bud'ko, Sergey L., Kogan, Vladimir G., Canfield, Paul C.
Publikováno v:
Phys. Rev. B 102, 094504 (2020)
The magnetic response of CaK(Fe$_{0.949}$Ni$_{0.051}$)$_4$As$_4$ was investigated by means of the muon-spin rotation/relaxation. The long-range commensurate magnetic order sets in below the N\'{e}el temperature $T_{\rm N}= 50.0(5)$~K. The density-fun
Externí odkaz:
http://arxiv.org/abs/2006.11320
Autor:
Bud'ko, Sergey L., Kogan, Vladimir G., Prozorov, Ruslan, Meier, William R., Xu, Mingyu, Canfield, Paul C.
Publikováno v:
Phys. Rev. B 98, 144520 (2018)
Temperature dependent $^{57}$Fe M\"ossbauer spectroscopy and specific heat measurements for CaK(Fe$_{1-x}$Ni$_x$)$_4$As$_4$ with $x$ = 0, 0.017, 0.033, and 0.049 are presented. No magnetic hyperfine field (e.g. no static magnetic order) down to 5.5 K
Externí odkaz:
http://arxiv.org/abs/1810.07084
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Publikováno v:
Phys. Rev. B 96, 104516 (2017)
We revisit the problem of the surface superconductivity nucleation focusing on the detailed study of the critical field $H_{c3}$ as a function of temperature and disorder. Using the semiclassical Eilenberger formalism we find that away from the Ginzb
Externí odkaz:
http://arxiv.org/abs/1708.03637
Autor:
Lin, Shi-Zeng, Kogan, Vladimir G.
Publikováno v:
Phys. Rev. B 95, 054511 (2017)
In superconductors with strong coupling between superconductivity and elasticity manifested in a strong dependence of transition temperature on pressure, there is an additional contribution to inter-vortex interactions due to the strain field generat
Externí odkaz:
http://arxiv.org/abs/1612.04877
We consider the phase diagram of a ferromagnetic system driven to a quantum phase transition with a tuning parameter $p$. Before being suppressed, the transition becomes of the first order at a tricritical point, from which wings emerge under applica
Externí odkaz:
http://arxiv.org/abs/1608.04424
Autor:
Kaluarachchi, Udhara S., Taufour, Valentin, Böhmer, Anna E., Tanatar, Makariy A., Bud'ko, Sergey L., Kogan, Vladimir G., Prozorov, Ruslan, Canfield, Paul C.
Publikováno v:
Phys. Rev. B 93, 064503 (2016)
The pressure dependence of the upper critical field, $H_\textrm{c2,c}$, of single crystalline FeSe was studied using measurements of the inter-plane resistivity, $\rho_{\textrm{c}}$ in magnetic fields parallel to tetragonal $c$-axis. $H_\textrm{c2,c}
Externí odkaz:
http://arxiv.org/abs/1511.08766
Autor:
Taufour, Valentin, Foroozani, Neda, Lim, Jinhyuk, Tanatar, Makariy A, Kaluarachchi, Udhara, Kim, Stella K, Liu, Yong, Lograsso, Thomas A, Kogan, Vladimir G, Prozorov, Ruslan, Budko, Sergey L, Schilling, James S, Canfield, Paul C
Publikováno v:
Physical Review B Rapid Communications Vol.89, 220509(R) (2014)
We report measurements of electrical resistivity under pressure to 5.8 GPa, magnetization to 6.7 GPa,and ac susceptibility to 7.1 GPa in KFe2As2. The previously reported change of slope in the pressure dependence of the superconducting transition tem
Externí odkaz:
http://arxiv.org/abs/1402.7054
Publikováno v:
Phys. Rev. B 87, 144501 (2013)
Magnetic flux dynamics in type-II superconductors is studied within the model of a viscous nonlinear diffusion of vortices for various sample geometries. We find that time dependence of magnetic moment relaxation after the field is switched off can b
Externí odkaz:
http://arxiv.org/abs/1302.4312