Journal of Superconductivity

, Volume 10, Issue 4, pp 315–318 | Cite as

Anomalous Jahn-Teller distortions in La0.75Ca0.25MnO3 system: An X-ray absorption study

  • M. Brunelli
  • A. Lanzara
  • N. L. Saini
  • A. Bianconi
  • A. Valletta
  • P. G. Radaelli
Article

Abstract

MnK-edge X-ray absorption near edge structure (XANES) measurements have been made to study the temperature-dependent lattice effects in the La0.75Ca0.25MnO3 system. The high-resolution XANES spectra recorded with high signal-to-noise ratio have allowed us to study the temperature dependence of the Jahn-Teller splitting indicated directly by the dipole forbidden pre-peaks corresponding to transition in Mn 3d states. The results show splitting of theeg state in its two orbitals (dx2 -y2 andd3z2-r2. The energy splitting shows anomalous temperature dependence across the giant magnetoresistance transition temperature.

Key Words

Jahn-Teller effect La0.75Ca0.25MnO3 giant magnetoresistance 

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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • M. Brunelli
    • 1
  • A. Lanzara
    • 1
  • N. L. Saini
    • 1
  • A. Bianconi
    • 1
  • A. Valletta
    • 1
  • P. G. Radaelli
    • 2
  1. 1.Dipartimento di FisicaUniversità di Roma “ La Sapienza”RomaItaly
  2. 2.Institut Laue LangevinGrenobleFrance

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