First order 0–π phase transitions in superconductor/ferromagnet/superconductor trilayers
A. V. Samokhvalov, A. I. Buzdin
DOI 10.1103/PhysRevB.92.054511 · Physical Review B
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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 obtain the Ginzburg–Landau expansion and compute the condensation free energy and entropy of the 0 (even) and π (odd) order parameter configurations. The first order 0–π transition as a function of temperature T occurs, which is responsible for a jump of the averaged magnetic field penetration depth λ(T) recently observed in experiments [N. Pompeo et al., Phys. Rev. B 90, 064510 (2014)]. The generalized Ginzburg-Landau functional was proposed to describe the 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–π transition. In an rf superconducting quantum interference device (SQUID), coexistence of stable and metastable 0 and π states provides integer and half-integer fluxoid configurations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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