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Field-Induced Spin Mixing in Ultrathin Superconducting Al and Be Films in High Parallel Magnetic Fields
 

Summary: Field-Induced Spin Mixing in Ultrathin Superconducting Al and Be Films
in High Parallel Magnetic Fields
P.W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
(Received 27 August 2003; published 10 February 2004)
We report spin-dependent electron density of states (DOS) studies of ultrathin superconducting Al
and Be films in high parallel magnetic fields. Superconductor-insulator-superconductor (SIS) tunneling
spectra are presented in which both the film and the counterelectrode are in the paramagnetic limit.
This SIS configuration is exquisitely sensitive to spin mixing and/or spin flip processes which are
manifest as DOS singularities at eV 20 eVz. Both our Al and Be data show a well defined subgap
peak whose magnitude grows dramatically as the parallel critical field is approached. Though this
feature has previously been attributed to spin-orbit scattering, it is more consistent with fluctuations
into a field induced mixed-spin state.
DOI: 10.1103/PhysRevLett.92.067003 PACS numbers: 74.78.Db, 74.40.+k, 74.50.+r
With recent discoveries of itinerant ferromagnetic
superconductors, represented by UGe2 [1] and ZrZn2 [2],
and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) super-
conductivity in CeCoIn5 [3,4], research on systems ex-
hibiting a nontrivial interplay between magnetism and
superconductivity has moved to the forefront of con-

  

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

 

Collections: Materials Science