Orientation Dependence of the Magnetic Phase Diagram of Yb<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>

ORAL

Abstract

We present the orientation dependence of the magnetic phase diagram of stoichiometric Yb2Ti2O7 using four experimental probes: magnetization, heat capacity, susceptibility, and neutron scattering. The magnetic phase diagram for fields along 〈110〉 shows dramatic reentrant character (similar to fields along 〈111〉), whereas for fields along 〈100〉, the upper phase boundary collapses and the system enters a field polarized state for small applied fields. By comparing this data to theoretical models, we show that Yb2Ti2O7 is a cubic ferromagnet that is qualitatively described by Landau theory, but a comparison of upper critical fields show that the system cannot be described only by classical mean-field considerations, more that it is subject to collective or quantum effects.

*DFG (107745057 and 390814868), ERC (291079 and 788031), BMBF (05K16WO6), U.S. DOE (DE-SC0019331), Gordon and Betty Moore foundation (GBMF4532 and GBMF5305), ICAM QuantEmX, NSF-DMR (0821005 and 1508249)

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Presenters

  • Steffen Säubert

    • Colorado State University

Authors

  • Steffen Säubert

    • Colorado State University

  • Allen Scheie

    • Oak Ridge National Lab
    • Johns Hopkins University
    • Oak Ridge National Laboratory
    • Institute for Quantum Matter, Johns Hopkins University

  • Christopher Duvinage

    • Technical University of Munich

  • Jonas Kindervater

    • Johns Hopkins University
    • Physics Department, Technical University of Munich, Germany
    • Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University

  • Shu Zhang

    • University of California, Los Angeles
    • Physics, University of California, Los Angeles
    • Johns Hopkins University

  • Hitesh Changlani

    • Physics, Florida State University
    • Florida State University
    • Physics, Florida State

  • Guangyong Xu

    • Center of Neutron Research, National Institute of Standards and Technology
    • Neutron-Condensed Matter Science Group, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NIST
    • Center for Neutron Research, National Institute of Standards and Technology
    • NIST Center for Neutron Research
    • Oak Ridge National Laboratory

  • Seyed Koohpayeh

    • Johns Hopkins University

  • Oleg Tchernyshyov

    • Johns Hopkins University
    • Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University

  • Collin Leslie Broholm

    • The Johns Hopkins University
    • Johns Hopkins University
    • Physics and Astronomy, Johns Hopkins University
    • Physics, The Johns Hopkins University
    • Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University

  • Christian Pfleiderer

    • Technical University of Munich
    • Physics Department, Technical University of Munich, Germany