Competition between π-coupling and Fulde-Ferrell-Larkin-Ovchinnikov modulation in a periodic array of ferromagnetic-superconducting bilayers of atomic thickness

S. Tollis; J. Cayssol; A. Buzdin

doi:10.1103/PhysRevB.73.174519

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Competition between π-coupling and Fulde-Ferrell-Larkin-Ovchinnikov modulation in a periodic array of ferromagnetic-superconducting bilayers of atomic thickness

S. Tollis, J. Cayssol, A. Buzdin

DOI 10.1103/PhysRevB.73.174519 · Physical Review B

T1

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Abstract

We present the detailed theoretical study of a heterostructure with two coupled ferromagnetic superconducting layers as unit cell. Our model may be also applicable to the layered superconductors with alternating interlayer coupling in a parallel magnetic field. It is demonstrated that such systems exhibit a competition between the nonuniform Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and the π superconducting state where the sign of the superconducting order parameter is opposite in adjacent layers. We determine the complete temperature-field phase diagram in the Pauli limit. In the case of low interlayer coupling we obtain a π phase inserted within the FFLO phase and located close to the usual tricritical point, whereas for strong interlayer coupling the bilayer in the π state reveals a very high paramagnetic limit and the phenomenon of field-induced superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown