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Interface Spin-Orbit Coupling in a Non-centrosymmetric Thin-Film Superconductor X. S. Wu and P. W. Adams
 

Summary: Interface Spin-Orbit Coupling in a Non-centrosymmetric Thin-Film Superconductor
X. S. Wu and P. W. Adams
Department of Physics and Astronomy
Louisiana State University
Baton Rouge, Louisiana, 70803
Y. Yang and R. L. McCarley
Department of Chemistry and the Center for Biomodular Multi-scale Systems
Louisiana State University
Baton Rouge, LA, 70803
(Dated: September 20, 2005)
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 d = 2 - 30 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||/o 1/d suggesting that the spin-orbit coupling
energy was proportional to o/d2
. Tilted field measurements showed that contrary to recent theory,
the ISOC induces a large in-plane superconducting susceptibility but only a very small transverse

  

Source: Adams, Philip W. - Department of Physics and Astronomy, Louisiana State University

 

Collections: Materials Science