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First-order spin-paramagnetic transition and tricritical point in ultrathin Be films P. W. Adams and P. Herron
 

Summary: First-order spin-paramagnetic transition and tricritical point in ultrathin Be films
P. W. Adams and P. Herron
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 12 January 1998
We report measurements of the parallel critical magnetic field of thin superconducting beryllium films
with Tc 0.6 K. The critical field transitions were spin-paramagnetically limited and found to be strongly
hysteretic below a tricritical point at Ttri 190 mK. The magnitude of the hysteresis and Ttri were observed
to be completely suppressed in field misalignments 1. Time relaxation measurements in the hyster-
etic regime showed simple exponential decays in the highest quality films and nonexponential decays inter-
spersed with avalanches in more inhomogeneous samples. S0163-1829 98 51030-2
The parallel critical magnetic-field behavior of thin-film
superconductors has garnered a great deal of theoretical and
experimental interest over the past 30 years.1,2
In sufficiently
thin films the orbital currents are suppressed and the cou-
pling of the field to the electronic spins drives the system
into the normal state in what is commonly known as the spin

  

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

 

Collections: Materials Science