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.

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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