Terahertz Time-Domain Magnetospectroscopy of La<sub>0.875</sub>Sr<sub>0.125</sub>MnO<sub>3</sub>

ORAL

Abstract

Lanthanum strontium manganite (La1-xSrxMnO3 or LSMO) has attracted considerable interest over the last few decades due to its rich electronic phase diagram. The strong interplay among the charge, spin, orbital, and lattice degrees of freedom are believed to be behind the various phases that these compounds exhibit, but a microscopic understanding has been elusive. In particular, it is not understood what causes the metal-insulator transition at low temperatures in underdoped LSMO (0.1<x<0.15). Previous neutron and X-ray diffraction measurements suggested the existence of certain charge and orbital ordering in the low-temperature phase. Here we study different phases of La0.875Sr0.125MnO3 as a function of temperature and magnetic field via THz time-domain magnetospectroscopy. Optical conductivity spectra exhibited characteristic metallic or insulating behaviors in the different phases examined. We observed the emergence of a new collective mode in the insulator phase at the lowest temperatures, which shifts with the applied magnetic field. These measurements provide significant new insights into the underlying mechanism of the metal-insulator transition in the underdoped LSMO.

*Supported by the NSF through the CDCM: an NSF MRSEC under Cooperative Agreement No. DMR-1720595.

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Presenters

  • Fuyang Tay

    • Rice University
    • Rice Univ
    • Department of Electrical and Computer Engineering, Rice University

Authors

  • Fuyang Tay

    • Rice University
    • Rice Univ
    • Department of Electrical and Computer Engineering, Rice University

  • Jiaming He

    • University of Texas at Austin
    • Texas Materials Institute, University of Texas at Austin
    • Materials Science and Engineering Program, Mechanical Engineering, University of Texas at Austin

  • Nicolas Marquez Peraca

    • Department of Physics and Astronomy, Rice University

  • Xinwei Li

    • Rice University
    • Department of Physics, California Institute of Technology
    • Department of Electrical and Computer Engineering, Rice University

  • Andrey Baydin

    • Rice University
    • Rice Univ
    • Department of Electrical and Computer Engineering, Rice University

  • Jianshi Zhou

    • University of Texas at Austin
    • Materials Science and Engineering Program, Department of Mechanical Engineering, University of Texas at Austin
    • University of Texas (Austin, USA)
    • University of Texas
    • Texas Materials Institute, University of Texas at Austin
    • Materials Science and Engineering Program, Mechanical Engineering, University of Texas at Austin

  • Junichiro Kono

    • Electrical and Computer Engineering, Rice University
    • Department of Electrical and Computer Engineering, Rice Univ
    • Rice University
    • Rice Univ
    • Department of Electrical and Computer Engineering, Rice University
    • Department of Physics and Astronomy, Rice University