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Pressure Dependence of the Electrical Properties of Gabi Solidified in Low Gravity

Published online by Cambridge University Press:  26 February 2011

M. K. Wu ,
J. R. Ashburn ,
C. J. Torng ,
P. A. Curreri  and
C. W. Chu
M. K. Wu
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899
J. R. Ashburn
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899
C. J. Torng
Affiliation:
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899
P. A. Curreri
Affiliation:
Space Science Laboratory, NASA Marshall Space Flight Center, AL 35812
C. W. Chu
Affiliation:
Department of Physics, University of Houston, Houston, TX 77004
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Abstract

Immiscible GaBi alloys were solidified during free fall in the Marshall Space Flight Cente4 drop tower which provides about 4.5 seconds of low gravity (about 10−4 g, g = 980 cm/s2 ). We have measured the electrical resistivity and magnetic susceptibility as a function of pressure (up to 18 kbar) and temperature (300K to 4.2K) of drop tower (DT) sample and ground control (GC) sample prepared under identical conditions except for gravity. At ambient pressure the electrical resistance of the DT sample exhibits a broad maximum at 100K, while that of GC sample decreases rapidly as temperature decreases. Both DT and GC samples becomesuperconducting at 7.7K (Tc2). However, a minor second superconducting phase with a transition temperature at 8.3K (Tc1) is observed only in the DT samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 87: Symposium O – Materials Processing in the Reduced Gravity Environment of Space , 1986 , 77
Copyright
Copyright © Materials Research Society 1987

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