Superconductivity in a Ferromagnetic Layered Compound

Details Superconductivity in a Ferromagnetic Layered Compound Superconductivity in a Ferromagnetic Layered Compound

2000-01-21

arxiv.org/abs/cond-mat/0001318v2

Phys. Rev. B Vol.62, No.21, pp.14541-14546 (2000)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, (Latex, revtex.sty, epsf.sty)

Scientific paper

10.1103/PhysRevB.62.14541

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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