Time-resolved optical study of the metal-to-insulator transition in Cd<sub>2</sub>Os<sub>2</sub>O<sub>7</sub>

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