Superconductivity in a ferromagnetic layered compound

Hiroshi Shimahara; Satomi Hata

doi:10.1103/PhysRevB.62.14541

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Superconductivity in a ferromagnetic layered compound

Hiroshi Shimahara, Satomi Hata

DOI 10.1103/PhysRevB.62.14541 · Physical Review B

T1

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Abstract

We examine superconductivity in layered systems with large Fermi-surface splitting due to coexisting ferromagnetic layers. In particular, the hybrid ruthenate-cuprate compound RuSr2GdCu2O8 is examined on the coexistence of the superconductivity and the ferromagnetism. We calculate critical fields of the superconductivity taking into account the Fulde-Ferrell-Larkin-Ovchinnikov state in a model with realistic Fermi surfaces the shapes of which are similar to those obtained by a band calculation. It is shown that the critical field is enhanced markedly due to nearly flat areas of the Fermi surfaces and the van Hove singularity points in the momentum space. The result of the critical field is very large for realistic parameters, and seems to support the coexistence in a microscopic scale. We also clarify the direction of the spatial oscillation of the order parameter, which may be observed by scanning tunneling microscope experiments.

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.	46	Pressure not reported	onset
R1.4Ce0.6RuSr2Cu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown