, Volume 10, Issue 4, pp 315-318

Anomalous Jahn-Teller distortions in La0.75 Ca0.25 MnO3 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 thee g state in its two orbitals (d x2 -y 2 andd 3z 2-r 2. The energy splitting shows anomalous temperature dependence across the giant magnetoresistance transition temperature.