Time-resolved optical study of the metal-to-insulator transition in Cd2Os2O7

ORAL

Abstract

The 5d transition metal oxide Cd2Os2O7 undergoes a continuous metal-to-insulator transition (MIT) with a concomitant magnetic transition into an all-in-all-out (AIAO) antiferromagnetic state below a critical temperature TMIT = 227 K. Here, we investigate the effects of this transition on its photo-carrier dynamics by performing temperature and wavelength dependent ultrafast optical reflectivity measurements. We show that the opening of a charge gap at TMIT causes a divergence like behavior of the photo-carrier relaxation time consistent with a Rothwarf-Taylor model. Our efforts to perform these experiments under high pressurize environments will also be discussed, which is motivated by recent resonant x-ray diffraction results on Cd2Os2O7 showing a monotonic suppression of AIAO order with pressure.

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Presenters

  • Chen Li

    Cal Tech, Caltech, Physics, Math & Astronomy

Authors

  • Chen Li

    Cal Tech, Caltech, Physics, Math & Astronomy

  • Xiang Li

    Caltech, Physics, Math & Astronomy

  • Daniel Silevitch

    Caltech, Caltech, Physics, Math & Astronomy, California Institute of Technology

  • Alon Ron

    Caltech, Physics, Math & Astronomy

  • Yishu Wang

    Johns Hopkins University, Caltech, Physics, Math & Astronomy, The Johns Hopkins University

  • Jiaqiang Yan

    Oak Ridge National Laboratory (USA), Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Materials Science and Technology, Materials Science and Technology, Oak Ridge National Lab, Materials Science and Engineering, The University of Tennessee

  • David George Mandrus

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA, University of Tennessee-Knoxville, Oak Ridge National Lab, Department of Materials Science and Engineering, University of Tennessee, University of Tennessee (Knoxville, USA), Department of Materials Science and Engineering, University of Tennessee Knoxville, Department of Material Science & Engineering, University of Tennessee, Material Science and Engineering, University of Tennessee, Materials Science and Technology, Materials Science and Technology, University of Tennessee, Knoxville, Department of Materials Science and Engineering, The University of Tennessee, Materials Science and Engineering, The University of Tennessee, Oak Ridge National Laboratory, Department of Material Science and Engineering, University of Tennessee

  • Thomas F Rosenbaum

    Caltech, Caltech, Physics, Math & Astronomy, California Institute of Technology

  • David Hsieh

    California Institute of Technology, Institute for Quantum Information and Matter, California Institute of Technology, Caltech, Caltech, Physics, Math & Astronomy, Physics, California Institute of Technology, Department of Physics, California Institute of Technology