Superconductivity in a Ferromagnetic Layered Compound

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.

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

References in corpus (3)

• Superconductivity in Ferromagnetic RuSr2GdCu2O8
• Phase Fluctuations and Kosterlitz-Thouless Transition in Two-Dimensional Fulde-Ferrell-Larkin-Ovchinnikov Superconductors
• Upper critical fields of quasi-low-dimensional superconductors with coexisting singlet and triplet pairing interactions in parallel magnetic fields

Cited by in corpus (9)

• The Fulde-Ferrell-Larkin-Ovchinnikov state in pnictides
• On the Fulde-Ferrell State in Spatially Isotropic Superconductors
• The Ruthenocuprates - Natural Superconductor-Ferromagnet Multilayers
• Temperature dependence of the upper critical field of an anisotropic singlet superconductivity in a square lattice tight-binding model in parallel magnetic fields
• Different types of the Fulde-Ferrell-Larkin-Ovchinnikov states induced by anisotropy effects
• Interlayer spin-singlet pairing induced by magnetic interactions in an antiferromagnetic superconductor
• Reduction of Pauli paramagnetic pair-breaking effect in antiferromagnetic superconductors
• Stabilization of the Fulde-Ferrell-Larkin-Ovchinnikov State by Tuning In-plane Magnetic-Field Direction: Application to a Quasi-One-Dimensional Organic Superconductor
• Fulde-Ferrell-Larkin-Ovchinnikov State in Perpendicular Magnetic Fields in Strongly Pauli-Limited Quasi-Two-Dimensional Superconductors