Ultrafast Electron Diffraction on a Magnetoresistive Manganite

ORAL

Abstract

Manganite compounds are known to host peculiar behavior such as colossal magnetoresistance, Jahn-Teller polarons and phase separation among other phenomena. In this experiment, we perform ultrafast electron diffraction experiments on freestanding La0.7Sr0.3MnO3 thin films. Ultrafast electron diffraction is a technique whereby an incident ultrafast pump pulse excites the sample into a non-equilibrium state and a probe pulse follows shortly thereafter, examining how the structure of the sample changes after excitation as a function of time delay. In this study, we observe that following the pump pulse, Bragg peaks show anomalous behavior in the form of enhanced coherence on a timescale of approximately 100 picoseconds. These results are discussed in terms of the melting of Jahn-Teller polarons.

*We thank the Gordon and Betty Moore foundation.

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Presenters

  • Anshul Kogar

    • Massachusetts Institute of Technology

Authors

  • Anshul Kogar

    • Massachusetts Institute of Technology

  • Alfred Zong

    • Physics, MIT
    • Massachusetts Institute of Technology

  • Timm Rohwer

    • Physics, MIT
    • Massachusetts Institute of Technology

  • Di Lu

    • Department of Physics, Stanford Institute for Materials and Energy Sciences, Stanford University
    • Department of Physics, Stanford University
    • Stanford Univeristy
    • Geballe Laboratory for Advanced Materials, Stanford University

  • Seung Sae Hong

    • Department of Applied Physics, Stanford Institute for Materials and Energy Sciences, Stanford University, SLAC National Accelerator Laboratory
    • Applied Physics, Stanford University
    • Department of Applied Physics, Stanford University
    • Stanford Univeristy

  • Harold Hwang

    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, CA, United States, Stanford Institute for Materials and Energy Science
    • Department of Applied Physics, Stanford University
    • Department of Applied Physics, Geballe Laboratory for Advanced Materials, Stanford Institute for Materials and Energy Sciences, Stanford University, SLAC National Accelerator
    • Applied Physics, Stanford University
    • Stanford Univ
    • Stanford University
    • Stanford Univeristy

  • Nuh Gedik

    • Physics, MIT
    • Massachusetts Institute of Technology
    • Massachusetts Inst of Tech-MIT
    • Physics, Massachusetts Institute of Technology