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]
< Leer menos
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Idioma
en
Article de revue
Este ítem está publicado en
Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2015-08-24, vol. 92, n° 5, p. 054511 (1-11)
American Physical Society
Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave en inglés
Proximity effects - Andreev reflection - SN and SNS junctions
Mesoscopic and nanoscale systems
Superconducting films and low-dimensional structures
Proyecto ANR
Etats de Majorana et d'Andreev dans des circuits hybrides combinant des matériaux magnétiques et supraconducteurs - ANR-12-BS04-0016
Orígen
Importado de HalCentros de investigación