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Title: Phase diagram and thermal expansion measurements on the system URu2–xFexSi2

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.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [4] ;  [5]
  1. Univ. of California, San Diego, CA (United States). Dept. of Physics and Center for Advanced Nanoscience
  2. Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience and Materials Science and Engineering Program
  3. Quantum Design Inc., San Diego, CA (United States)
  4. Temple Univ., Philadelphia, PA (United States). Physics Dept.
  5. Univ. of California, San Diego, CA (United States). Dept. of Physics and Center for Advanced Nanoscience and Materials Science and Engineering
Publication Date:
OSTI Identifier:
1331396
Grant/Contract Number:
NA0002909; FG02-01ER45872; FG02-04ER46105
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 113; Journal Issue: 47; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Univ. of California, San Diego, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; thermal expansion; URu2Si2; hidden order