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Fermi-liquid effects in the gapless state of marginally thin superconducting films G. Catelani
 

Summary: Fermi-liquid effects in the gapless state of marginally thin superconducting films
G. Catelani
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
X. S. Wu* and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
Received 25 June 2008; revised manuscript received 19 August 2008; published 17 September 2008
We present low-temperature tunneling density-of-states measurements in Al films in high parallel magnetic
fields. The thickness range of the films, t=69 nm, was chosen so that the orbital and Zeeman contributions
to their parallel critical fields were comparable. In this quasispin paramagnetically limited configuration, the
field produces a significant suppression of the gap, and at high fields the gapless state is reached. By comparing
measured and calculated tunneling spectra we are able to extract the value of the antisymmetric Fermi-liquid
parameter G0
and thereby deduce the quasiparticle density dependence of the effective parameter Geff
0
across
the gapless state.
DOI: 10.1103/PhysRevB.78.104515 PACS number s : 74.78.Db, 73.40.Jn, 74.25. q
I. INTRODUCTION
One of the most successful constructs in condensed-
matter physics is Landau's Fermi-liquid FL description of

  

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

 

Collections: Materials Science