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Multi-spin-state dynamics during insulator-metal crossover in LaCoO3

A. Doi, J. Fujioka, T. Fukuda, S. Tsutsui, D. Okuyama, Y. Taguchi, T. Arima, A. Q. R. Baron, and Y. Tokura
Phys. Rev. B 90, 081109(R) – Published 18 August 2014

Abstract

We have investigated the dynamics of spin-state crossover (SSC) for perovskite LaCoO3 through optical phonons by means of infrared and inelastic x-ray spectroscopy. Upon thermally induced SSC, anomalously dispersionless Co-O bond stretching phonons coupled to the thermally excited spin state have been identified. The enhanced spin-state fluctuation irrespective of the presence of a clear charge gap suggests the emergence of complex spin-state disproportionation involving low-, intermediate-, and high-spin states due to the strong correlation among thermally activated spin states.

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  • Received 16 April 2014
  • Revised 26 July 2014

DOI:https://doi.org/10.1103/PhysRevB.90.081109

©2014 American Physical Society

Authors & Affiliations

A. Doi1, J. Fujioka1, T. Fukuda2,3, S. Tsutsui4, D. Okuyama5, Y. Taguchi5, T. Arima5,6, A. Q. R. Baron3,4, and Y. Tokura1,5

  • 1Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 2Synchrotron Radiation Research Unit, JAEA/SPring-8, Sayo, Hyogo 679-5148, Japan
  • 3Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
  • 4Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan
  • 5RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
  • 6Department of Advanced Materials Science, University of Tokyo, Kashiwa 227-8561, Japan

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Issue

Vol. 90, Iss. 8 — 15 August 2014

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