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Density of states, entropy, and the superconducting Pomeranchuk effect in Pauli-limited Al films X. S. Wu* and P. W. Adams
 

Summary: Density of states, entropy, and the superconducting Pomeranchuk effect in Pauli-limited Al films
X. S. Wu* and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
G. Catelani
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
Received 24 August 2006; published 27 October 2006
We present low-temperature tunneling density of states measurements of Pauli-limited Al films in which the
Zeeman and orbital contributions to the critical field are comparable. We show that films in the thickness range
of 67 nm exhibit a reentrant parallel critical field transition which is associated with a high-entropy super-
conducting phase, similar to the high-entropy solid phase of 3
He responsible for the Pomeranchuk effect. This
phase is characterized by an excess of states near the Fermi energy so long as the parallel critical field
transition remains second order. Theoretical fits to the zero-bias tunneling conductance are in good agreement
with the data well below the transition but theory deviates significantly near the transition. The discrepancy is
a consequence of the emergence of e-e interaction correlations as one enters the normal state.
DOI: 10.1103/PhysRevB.74.144519 PACS number s : 74.50. r, 74.78.Db, 74.25.Dw
I. INTRODUCTION
Phase transitions are ubiquitous in physics and continue to
be a large and important part of current condensed matter
research. Perhaps the most common example of a classical

  

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

 

Collections: Materials Science