Multiple Magnetic Orders in the Three-dimensional Phase Diagram of CeAuSb<sub>2</sub> under Magnetic Field and Pressure

ORAL

Abstract

CeAuSb2 is a heavy-fermion antiferromagnet in which the antiferromagnetic transition temperature TN is suppressed by a modest c-axis magnetic field. With pressure, however, new magnetic phases emerge hindering the appearance of a pressure-induced quantum critical point. At ambient pressure, two metamagnetic transitions are observed at Hc1 ~ 2.8 T and Hc2 ~ 5.6 T. A recent neutron scattering study shows that the transition of magnetic structure occurs at Hc1 from a striped to a woven spin density wave. We report the magnetic field-pressure-temperature phase diagram of CeAuSb2 derived from the temperature and field dependence of electrical resistivity under pressure. Above 2.24 GPa, TN splits into two transitions which are connected to the metamagnetic transitions in the temperature-field phase diagram. We will discuss these multiple magnetic orders and critical points in the three-dimensional phase diagram.

*Work at Los Alamos was performed under the auspices of the US DOE, Division of Materials Sciences and Engineering. S. S. acknowledges support of the LANL LDRD program through a Director's Postdoctoral Fellowship.

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Presenters

  • Soonbeom Seo

    • Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

Authors

  • Soonbeom Seo

    • Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Sean Thomas

    • Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory
    • Los Alamos National Laboratory
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Filip Ronning

    • MPA-CMMS, Los Alamos National Laboratory
    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Eric Bauer

    • MPA-CMMS, Los Alamos National Laboratory
    • Los Alamos National Laboratory
    • Los Alamos Natl Lab
    • Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory
    • Los Alamos National Lab
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Joe Thompson

    • MPA-CMMS, Los Alamos National Laboratory
    • Los Alamos National Laboratory
    • Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory
    • Los Alamos Natl Lab
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Priscila Rosa

    • Los Alamos National Laboratory
    • Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory