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Field-temperature phase diagram and entropy landscape of CeAuSb2

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Zhao,  Lishan
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mackenzie,  Andrew P.
Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hicks,  Clifford W.
Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zhao, L., Yelland, E. A., Bruin, J. A. N., Sheikin, I., Canfield, P. C., Fritsch, V., et al. (2016). Field-temperature phase diagram and entropy landscape of CeAuSb2. Physical Review B, 93(19): 195124, pp. 1-7. doi:10.1103/PhysRevB.93.195124.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-E09C-0
Abstract
We report a field-temperature phase diagram and an entropy map for the heavy-fermion compound CeAuSb2. CeAuSb2 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 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.