Field-temperature phase diagram and entropy landscape of CeAuSb2
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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 endpoints 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 Néel transition the Ce moments are incorporated into the Fermi liquid. High-field data showing that the magnetic behavior is remarkably anisotropic are also reported.
Zhao , L , Yelland , E A , Bruin , J A N , Sheikin , I , Canfield , P C , Fritsch , V , Sakai , H , Mackenzie , A P & Hicks , C W 2016 , ' Field-temperature phase diagram and entropy landscape of CeAuSb 2 ' Physical Review. B, Condensed matter and materials physics , vol 93 , 195124 . DOI: 10.1103/PhysRevB.93.195124
Physical Review. B, Condensed matter and materials physics
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The authors thank the EPSRC and the Max Planck Society for financial support. The authors also acknowledge the support of the LNCMI-CNRS, member of the European Magnetic Field Laboratory (EMFL). E.A.Y. acknowledges support from the Royal Society. P.C.C. was supported, in part, by the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering through the Ames Laboratory. V.F. acknowledges support by the Deutsche Forschungsgemeinschaft through FOR 960. H.S. gratefully acknowledges fellowships from the Canon Foundation.