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Spin Proximity Effect in Ultrathin Superconducting Be-Au Bilayers X. S. Wu and P. W. Adams
 

Summary: Spin Proximity Effect in Ultrathin Superconducting Be-Au Bilayers
X. S. Wu and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
Y. Yang and R. L. McCarley
Department of Chemistry and the Center for Biomodular Multi-scale Systems, Louisiana State University,
Baton Rouge, Louisiana 70803, USA
(Received 12 September 2005; published 28 March 2006)
We present a detailed study of the effects of interface spin-orbit coupling on the critical field behavior of
ultrathin superconducting Be=Au bilayers. Parallel field measurements were made in bilayers with Be
thicknesses in the range of d 230 nm and Au coverages of 0.5 nm. Though the Au had little 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 Hck=0 / 1=d, suggesting that the spin-orbit
coupling energy was proportional to 0=d2. Tilted field measurements showed that, contrary to recent
theory, the interface spin-orbit coupling induces a large in-plane superconducting susceptibility but only a
very small transverse susceptibility.
DOI: 10.1103/PhysRevLett.96.127002 PACS numbers: 74.20.Rp, 73.40.Jn, 74.78.Db
In conventional BCS superconductivity, the condensate
is time reversal invariant and is formed from Cooper pairs
consisting of electrons of opposite momentum and oppo-

  

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

 

Collections: Materials Science