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Title: Field-temperature phase diagram and entropy landscape of CeAuSb2

Here, we report a field-temperature phase diagram and an entropy map for the heavy-fermion compound CeAuSb2. CeAuSb2 orders antiferromagnetically below TN = 6.6 K and has two metamagnetic transitions, at 2.8 and 5.6 T. The locations of the critical end points of the metamagnetic transitions, which may play a strong role in the putative quantum criticality of CeAuSb2 and related compounds, are identified. The entropy map reveals an apparent entropy balance with Fermi-liquid behavior, implying that above the Neel transition the Ce moments are incorporated into the Fermi liquid. High-field data showing that the magnetic behavior is remarkably anisotropic are also reported.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [1] ;  [8]
  1. Univ. of St. Andrews, St. Andrews (United Kingdom); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  2. Univ. of St. Andrews, St. Andrews (United Kingdom); Univ. of Edinburgh, Edinburgh (United Kingdom)
  3. Univ. of St. Andrews, St. Andrews (United Kingdom); Max Planck Institute for Solid State Research, Stuttgart (Germany)
  4. Lab. National des Champs Magnetiques Intenses (LNCMI-EMFL), CNRS, UJF, Grenoble (France)
  5. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  6. Univ. of Augsburg, Augsburg (Germany); Karlsruhe Institute of Technology, Karlsruhe (Germany)
  7. Univ. of St. Andrews, St. Andrews (United Kingdom); Osaka Univ., Osaka (Japan)
  8. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Publication Date:
OSTI Identifier:
1253021
Report Number(s):
IS-J-9016
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
EP/1031014/1; EP/G03673X/1; AC02-07CH11358; 960
Type:
Published Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 19; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE