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Proc Natl Acad Sci U S A. 2016 Nov 22;113(47):13348-13353. Epub 2016 Nov 8.

Phase diagram and thermal expansion measurements on the system URu2-xFexSi2.

Author information

1
Department of Physics, University of California, San Diego, La Jolla, CA 92093.
2
Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.
3
Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093.
4
Quantum Design, Inc., San Diego, CA 92121.
5
Physics Department, Temple University, Philadelphia, PA.
6
Department of Physics, University of California, San Diego, La Jolla, CA 92093; mbmaple@ucsd.edu.

Abstract

Thermal expansion, electrical resistivity, magnetization, and specific heat measurements were performed on URu2-xFexSi2 single crystals for various values of Fe concentration x in both the hidden-order (HO) and large-moment antiferromagnetic (LMAFM) regions of the phase diagram. Our results show that the paramagnetic (PM) to HO and LMAFM phase transitions are manifested differently in the thermal expansion coefficient. The uniaxial pressure derivatives of the HO/LMAFM transition temperature T0 change dramatically when crossing from the HO to the LMAFM phase. The energy gap also changes consistently when crossing the phase boundary. In addition, for Fe concentrations at xc ≈ 0.1, we observe two features in the thermal expansion upon cooling, one that appears to be associated with the transition from the PM to the HO phase and another one at lower temperature that may be due to the transition from the HO to the LMAFM phase.

KEYWORDS:

URu2Si2; hidden order; thermal expansion

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