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VOLUME 82, NUMBER 21 P H Y S I C A L R E V I E W L E T T E R S 24 MAY 1999 Exchange Fields and the Finite Bias Tunneling Anomaly in Paramagnetically Limited
 

Summary: VOLUME 82, NUMBER 21 P H Y S I C A L R E V I E W L E T T E R S 24 MAY 1999
Exchange Fields and the Finite Bias Tunneling Anomaly in Paramagnetically Limited
Superconducting Al Films
V. Yu. Butko and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803
I. L. Aleiner
Department of Physics, SUNY Stony Brook, Stony Brook, New York 11794
(Received 21 January 1999)
We present an experimental investigation of the finite bias anomaly in the tunneling density of
states of superconducting Al films above the paramagnetic limit. We show that the anomaly is a
manifestation of a new fluctuation mechanism that forms a pseudogap near the Zeeman energy. The
field dependence of the anomaly energy is in good agreement with the recent theory of Aleiner and
Altshuler, provided that the proper normal-state Landé g factor is used. We argue that the normal-state
g factor is reduced from the bare value of gn 2 to gn 1.7 by a negative exchange field in the
paramagnetic phase. [S0031-9007(99)09200-5]
PACS numbers: 73.40.Gk, 72.15.Rn, 73.50.­h
A magnetic field oriented along the plane of a thin film
superconductor affects superconductivity differently than
does a perpendicular field. In a parallel magnetic field,
the motion of the electrons in the transverse direction is

  

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

 

Collections: Materials Science