Anomalous Jahn-Teller distortions in La0.75Ca0.25MnO3 system: An X-ray absorption study
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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 WordsJahn-Teller effect La0.75Ca0.25MnO3 giant magnetoresistance
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- 15.A. Bianconi, inX-Ray Absorption: Principle, Applications, Techniques of EX A FS, S EX A FS, ami XANES R. Prinz and D. Koningsberger, eds. (Wiley, New York 1988), p. 573.Google Scholar