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Superconductivity in a Ferromagnetic Layered Compound

Hiroshi Shimahara·Satomi Hata
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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 RuSr_2GdCu_2O_8 is examined on the coexistence of the superconductivity and the ferromagnetism, which has been observed recently. We calculate critical fields of the superconductivity taking into account the Fulde-Ferrell-Larkin-Ovchinnikov state in a model with Fermi-surfaces which shapes are similar to those obtained by a band calculation. It is shown that the critical field is enhanced remarkably due to a Fermi-surface effect, and can be high enough to make the coexistence possible 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.

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Hiroshi Shimahara, Satomi Hata. 2000-01-24. Superconductivity in a Ferromagnetic Layered Compound. https://doi.org/10.1103/physrevb.62.14541

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