First order 0-pi phase transitions in superconductor/ferromagnet/superconductor trilayers
SAMOKHVALOV, A. V.
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
BUZDIN, Alexandre I.
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
SAMOKHVALOV, A. V.
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
BUZDIN, Alexandre I.
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
< Reduce
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Language
en
Article de revue
This item was published in
Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2015-08-24, vol. 92, n° 5, p. 054511 (1-11)
American Physical Society
English Abstract
We study the thermodynamics of the diffusive SFS trilayer composed of thin superconductor (S) and ferromagnet (F) layers. On the basis the self-consistent solutions of nonlinear Usadel equations in the F and S layers we ...Read more >
We study the thermodynamics of the diffusive SFS trilayer composed of thin superconductor (S) and ferromagnet (F) layers. On the basis the self-consistent solutions of nonlinear Usadel equations in the F and S layers we obtain the Ginzburg--Landau expansion and compute the condensation free energy and entropy of the $0$ (even) and $\pi$ (odd) order parameter configurations. The first order $0-\pi$ transition as a function of temperature $T$ occurs, which is responsible for a jump of the averaged magnetic field penetration depth $\lambda(T)$ recently observed on experiments [N.Pompeo, et. al., Phys. Rev. B 90, 064510 (2014)]. The generalized Ginzburg-Landau functional was proposed to describe SFS trilayer for arbitrary phase difference between the superconducting order parameters in the S layers. The temperature dependence of the SFS Josephson junction critical current demonstrates the strong anharmonicity of the corresponding current--phase relation in the vicinity of the $0-\pi$ transition. In rf SQUID, coexistence of stable and metastable $0$ and $\pi$ states provides integer and half--integer fluxoid configurations.Read less <
English Keywords
Proximity effects - Andreev reflection - SN and SNS junctions
Mesoscopic and nanoscale systems
Superconducting films and low-dimensional structures
ANR Project
Etats de Majorana et d'Andreev dans des circuits hybrides combinant des matériaux magnétiques et supraconducteurs - ANR-12-BS04-0016
Origin
Hal imported