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VOLUME 83, NUMBER 18 P H Y S I C A L R E V I E W L E T T E R S 1 NOVEMBER 1999 State Memory and Reentrance in a Paramagnetically Limited Superconductor
 

Summary: VOLUME 83, NUMBER 18 P H Y S I C A L R E V I E W L E T T E R S 1 NOVEMBER 1999
State Memory and Reentrance in a Paramagnetically Limited Superconductor
V. Yu. Butko* and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803
E. I. Meletis
Department of Mechanical Engineering, Materials Science and Engineering Program, Louisiana State University,
Baton Rouge, Louisiana 70803
(Received 30 April 1999)
We report observations of a new quasistatic nonequilibrium phenomenon in the density of electronic
states (DOS) of a superconductor. Tunneling measurements of the DOS of ultrathin Al films, at the spin
paramagnetically limited parallel magnetic field transition, reveal a strongly hysteretic DOS spectrum.
We show that the hysteresis can be characterized as a quasistatic state memory effect in which the state
of a film (normal or superconducting) is determined by its state prior to entering the hysteretic region.
We also show that state memory can lead to the onset of superconductivity with increasing temperature,
i.e., reentrance.
PACS numbers: 74.76.Db, 74.25.Dw, 74.40.+k, 74.50.+r
Recently it has been recognized that the superconductor
to insulator (S-I) transition in disordered two-dimensional
(2D) metal films is an important realization of a 2D quan-
tum phase transition [1]. This has motivated a number of

  

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

 

Collections: Materials Science