Superconductivity in a Ferromagnetic Layered Compound
PR_2000_B62_21_p14541_1.pdf 82.5 KB
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, 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.
Physical Review B - Condensed Matter and Materials Physics
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The American Physical Society
Copyright (c) 2000 The American Physical Society
Graduate School of Advanced Sciences of Matter