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Single hole motion in LaMnO3.

W G Yin1, H Q Lin, C D Gong

  • 1Department of Physics, The Chinese University of Hong Kong, Sha Tin, Hong Kong, People's Republic of China. wgyin@yahoo.com

Physical Review Letters
|July 20, 2001
PubMed
Summary
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Quantum effects in LaMnO3 are minimal. Strong Jahn-Teller distortions significantly broaden quasiparticle bandwidth, even with polaron effects, impacting electron-phonon interactions.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • LaMnO3 exhibits complex electronic and magnetic properties driven by electron-phonon coupling.
  • Understanding hole motion is crucial for explaining its colossal magnetoresistance and other phenomena.

Purpose of the Study:

  • To investigate the role of electron-phonon interactions and lattice distortions on single hole motion in LaMnO3.
  • To quantify the impact of Jahn-Teller distortions and phonons on quasiparticle bandwidth.

Main Methods:

  • Classical approximation for Jahn-Teller lattice distortions.
  • Modified Lang-Firsov approximation for dynamical breathing-mode phonons.
  • Self-consistent Born approximation and exact diagonalization for hole-orbital-excitation scattering.

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Main Results:

  • Quantum effects of electron-phonon interaction are found to be small in the realistic parameter space of LaMnO3.
  • The quasiparticle bandwidth in the purely orbital t-J model is approximately 2.2J.
  • Strong static Jahn-Teller lattice distortions significantly broaden the quasiparticle bandwidth to the order of t, overriding polaron band narrowing.

Conclusions:

  • Static Jahn-Teller distortions play a dominant role in determining the electronic properties of LaMnO3.
  • The simplified models capture essential physics, suggesting that quantum fluctuations are less critical than static lattice effects in this system.