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Evolution of Superconducting and Hidden Order Phases in URu2Si2 Under Applied Pressure

Published online by Cambridge University Press:  01 February 2011

M. Brian Maple ,
Jason R. Jeffries ,
Nicholas P. Butch  and
Benjamin T. Yukich
M. Brian Maple
Affiliation:
mbmaple@physics.ucsd.edu, University of California, San Diego, Department of Physics and Institute for Pure and Applied Physical Sciences, 9500 Gilman Drive, La Jolla, CA, 92093, United States
Jason R. Jeffries
Affiliation:
mbmaple@physics.ucsd.edu, University of California, San Diego, Department of Physics and Institute for Pure and Applied Physical Sciences, 9500 Gilman Drive, La Jolla, CA, 92093, United States
Nicholas P. Butch
Affiliation:
nbutch@physics.ucsd.edu, University of California, San Diego, Department of Physics and Institute for Pure and Applied Physical Sciences, 9500 Gilman Drive, La Jolla, CA, 92093, United States
Benjamin T. Yukich
Affiliation:
mbmaple@physics.ucsd.edu, University of California, San Diego, Department of Physics and Institute for Pure and Applied Physical Sciences, 9500 Gilman Drive, La Jolla, CA, 92093, United States
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Abstract

Electrical resistivity measurements performed under applied hydrostatic pressure and in magnetic fields have been used to probe the hidden order (HO) and superconducting (SC) states of URu2Si2, which have ambient-pressure transition temperatures TO = 17.5 K and Tc = 1.5 K, respectively. TO increases with applied pressure and a distinct kink in its pressure dependence is observed at 15 kbar; this feature is associated with the onset of antiferromagnetism. The pressure dependence of the SC upper critical field has been measured with the external field aligned parallel to both crystalline axes. The SC phase is smoothly suppressed to a critical pressure of about 15 kbar and no qualitative change in the critical field curves is observed. The co-evolution of the HO and SC phases is discussed within the context of a model in which the two phases compete for Fermi surface fraction.

Keywords

actinidesuperconductingelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1104: Symposium NN – Actinides 2008—Basic Science, Applications and Technology , 2008 , 1104-NN09-02
Copyright
Copyright © Materials Research Society 2008

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