Field-Temperature Phase Diagram and Entropy Landscape of CeAuSb${}_2$

Abstract

We report a field-temperature phase diagram and an entropy map for the heavy fermion compound CeAuSb${}_2$. CeAuSb${}_2$ orders antiferromagnetically below $T_N=6.6$~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 CeAuSb${}_2$ 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.

arXiv comment7 pages, 9 figures

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• Low temperature thermodynamic investigation of the phase diagram of Sr${}_3$Ru${}_2$O${}_7$
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• Electronic and magnetic properties of stoichiometric CeAuBi${}_2$
• Effect of Applied Orthorhombic Lattice Distortion on the Antiferromagnetic Phase of CeAuSb${}_2$
• Tuning of charge density wave transitions in LaAu${}_x$Sb${}_2$ by pressure and Au-stoichiometry
• Interwoven atypical quantum states in CeLiBi${}_2$
• Coupling of optical phonons with Kondo effect and magnetic orders in antiferromagnetic Kondo lattice CeAuSb${}_2$
• Spin-density-wave order controlled by uniaxial stress in CeAuSb${}_2$
• Magnetic field induced antiferromagnetic tricritical points in Ce${}_2$Sb and Ce${}_2$Bi
• Effects of physical and chemical pressure on charge density wave transitions in LaAg1-xAuxSb2 single crystals
• Effects of external pressure on the narrow gap semiconductor Ce${}_3$Cd${}_2$As${}_6$