Field-induced quantum critical point in itinerant antiferromagnet Ti<sub>3</sub>Cu<sub>4</sub>

ORAL

Abstract

Magnetism exists on a spectrum spanning the local to itinerant limit. Theory in the local moment extreme is experimentally confirmed in magnetic insulators where the magnetism originates from unfilled electronic shells. However, in the itinerant limit, where magnetism stems from band effects, experiment lags theory as there are only three known purely itinerant magnets Sc3In, ZrZn2, and TiAu, raising the need for discovery of new such systems. Also, it is of interest to understand what happens as magnetic order is suppressed to T=0 via various tuning parameters towards a quantum critical point (QCP).

We present results on singles crystals of a new antiferromagnet with no magnetic constituent elements, Ti3Cu4. Electrical, thermodynamic and diffraction measurements reveal the itinerant nature of the magnetic order below 11.3 K, supported by DFT calculations. The magnetic order is suppressed towards a QCP with Hc=4.87 T. We provide evidence of a Fermi liquid to non-Fermi liquid behavior crossover convergent at the QCP, giving credence to a novel state near the QCP. This field-induced QCP in an itinerant system serves as an example of a QCP without the effect of Kondo correlations, and is essential to the unified theory of magnetism and global understanding of quantum criticality.

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Presenters

  • Jaime Moya

    • Rice Univ

Authors

  • Jaime Moya

    • Rice Univ

  • Alannah Hallas

    • University of British Columbia
    • Department of Physics and Astronomy and Quantum Matter Institute, University of British Columbia

  • Chien-Lung Huang

    • Rice Univ
    • Department of Physics and Astronomy, Rice University

  • Vaideesh Loganathan

    • Rice Univ
    • Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice Univ

  • Lazar Kish

    • University of Illinois Urbana-Champagne
    • University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign

  • Adam Aczel

    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • James W Beare

    • McMaster University

  • Yipeng Cai

    • University of British Columbia

  • Graeme Luke

    • McMaster University
    • Dept. of Physics and Astronomy, McMaster University

  • Franziska Weickert

    • National High Magnetic Field Laboratory
    • Los Alamos National Laboratory

  • Andriy Nevidomskyy

    • Department of Physics and Astronomy, Rice University
    • Rice Univ
    • Department of Physics and Astronomy, Rice University, TX, USA
    • Rice Center for Quantum Materials, Rice University
    • Rice University
    • Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice Univ
    • Physics and Astronomy, Rice University

  • Christos Malliakas

    • Argonne National Laboratory

  • Mercouri Kanatzidis

    • Chemistry, Northwestern University
    • Argonne National Laboratory
    • Northwestern University
    • Chemistry Department, Northwestern University

  • Emilia Morosan

    • Rice Univ
    • Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice Univ
    • Rice University
    • Department of Physics and Astronomy, Rice University

  • Kyle Bayliff

    • Rice Univ