Interface Spin-Orbit Coupling in a Non-centrosymmetric Thin-Film Superconductor

Details Interface Spin-Orbit Coupling in a Non-centrosymmetric Thin-Film Superconductor Interface Spin-Orbit Coupling in a Non-centrosymmetric Thin-Film Superconductor

2005-09-14

arxiv.org/abs/cond-mat/0509385v2

Physics

Condensed Matter

Superconductivity

Scientific paper

We present a detailed study of the effects of interface spin-orbit coupling (ISOC) on the critical field behavior of non-centrosymmetric (NCS), ultra-thin superconducting Be/Au bilayers. Parallel field measurements were made in bilayers with Be thicknesses in the range of 2 - 10 nm and Au coverages of 0.5 nm. Though the Au had no significant effect on the superconducting gap, it produced profound changes in the spin states of the system. In particular, the parallel critical field exceeded the Clogston limit by an order of magnitude in the thinnest films studied. In addition, the parallel critical field unexpectedly scaled as Hc||/\Delta ~ 1/d suggesting that the spin-orbit coupling energy was proportional to Delta/d^2. Tilted field measurements showed that contrary to recent theory, the ISOC induces a large in-plane superconducting susceptibility but only a very small transverse susceptibility.

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