Mn K-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 the e(g) state in its two orbitals (d(x2-y2) and d(3z2-r2)). The energy splitting shows anomalous temperature dependence across the giant magnetoresistance transition temperature.
Anomalous Jahn-Teller distortions in La0.75Ca0.25MnO3 system: An x-ray absorption study / M., Brunelli; A., Lanzara; Saini, Naurang Lal; Bianconi, Antonio; A., Valletta; P. G., Radaelli. - In: JOURNAL OF SUPERCONDUCTIVITY. - ISSN 0896-1107. - STAMPA. - 10:(1997), pp. 315-318. [10.1007/BF02765710]
Anomalous Jahn-Teller distortions in La0.75Ca0.25MnO3 system: An x-ray absorption study
SAINI, Naurang Lal;BIANCONI, Antonio;
1997
Abstract
Mn K-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 the e(g) state in its two orbitals (d(x2-y2) and d(3z2-r2)). The energy splitting shows anomalous temperature dependence across the giant magnetoresistance transition temperature.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
