Phase diagram and thermal expansion measurements on the system URu2-xFexSi2.
Thermal expansion, electrical resistivity, magnetization, and specific heat measurements were performed on URu2-xFexSi2single 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 T0change 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.
Department of Physics, University of California, San Diego, La Jolla, CA 92093.|Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.
Sheng
S
Ran
Department of Physics, University of California, San Diego, La Jolla, CA 92093.|Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.
Christian T
CT
Wolowiec
Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.|Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093.
Inho
I
Jeon
Department of Physics, University of California, San Diego, La Jolla, CA 92093.|Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.
Naveen
N
Pouse
Department of Physics, University of California, San Diego, La Jolla, CA 92093.|Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.
Noravee
N
Kanchanavatee
Department of Physics, University of California, San Diego, La Jolla, CA 92093.|Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.
Benjamin D
BD
White
Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.|Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093.
Kevin
K
Huang
Quantum Design, Inc., San Diego, CA 92121.
Dinesh
D
Martien
Quantum Design, Inc., San Diego, CA 92121.
Tyler
T
DaPron
Quantum Design, Inc., San Diego, CA 92121.
David
D
Snow
Quantum Design, Inc., San Diego, CA 92121.
Mark
M
Williamsen
Quantum Design, Inc., San Diego, CA 92121.
Stefano
S
Spagna
Physics Department, Temple University, Philadelphia, PA.
Peter S
PS
Riseborough
Department of Physics, University of California, San Diego, La Jolla, CA 92093; mbmaple@ucsd.edu.|Center for Advanced Nanoscience, University of California, San Diego, La Jolla, CA 92093.|Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093.
M Brian
MB
Maple
URu2Si2; hidden order; thermal expansion