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Raman study of the orbital-phonon coupling in LaCoO3.

A Ishikawa1, J Nohara, S Sugai

  • 1Venture Business Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan. a_ishikawa@nucc.cc.nagoya-u.ac.jp

Physical Review Letters
|November 5, 2004
PubMed
Summary

The magnetic state of LaCoO3 transitions with temperature, exciting intermediate spin states that cause Jahn-Teller distortions. These distortions anomalously affect Raman active phonon modes, particularly the Jahn-Teller vibration mode.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Magnetism

Background:

  • LaCoO3 exhibits a spin transition from low spin (S=0) to intermediate spin (IS, S=1) states above 50 K.
  • The intermediate spin state in LaCoO3 involves partially filled e(g) orbitals, leading to Jahn-Teller (JT) distortion.

Purpose of the Study:

  • To investigate the impact of thermally excited intermediate spin states and cooperative Jahn-Teller distortions on the magnetic and vibrational properties of LaCoO3.
  • To analyze the temperature dependence of Raman active phonon modes in relation to electronic and structural changes.

Main Methods:

  • Raman spectroscopy was employed to probe the vibrational modes of LaCoO3.
  • Temperature-dependent measurements were conducted to observe changes in phonon modes associated with magnetic and orbital transitions.

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Main Results:

  • All Raman active phonon modes were found to be influenced by the excitation of intermediate spin Co3+ ions.
  • A significant anomalous temperature dependence was observed specifically for the Jahn-Teller vibration mode.

Conclusions:

  • The study demonstrates a strong coupling between electronic spin states, Jahn-Teller distortions, and lattice vibrations in LaCoO3.
  • The anomalous behavior of the JT vibration mode provides insights into the cooperative JT distortion and orbital ordering mechanisms.