Local lattice of the charge ordered La0.5Ca0.5MnO3 has been studied by temperature dependent Mn K-edge x-ray absorption measurements, using fluorescence detection method, to explore how the local lattice distortions are associated with the charge ordering in this system. The x-ray absorption near edge structure (XANES) reveals an abrupt change in the local MnO6 octahedral geometry, across the charge ordering temperature. The extended x-ray absorption fine structure (EXAFS) analysis shows largely distorted MnO6 octahedra with coexisting Q(3)-type and Q(2)-type of Jahn=Teller (JT) modes at low temperature in the commensurate charge ordered phase. We find that small JT distortions persist also in the charge disordered phase at high temperature.

Local structure of the charge ordered La0.5Ca0.5MnO3 / S., Agrestini; Saini, Naurang Lal; A., Lanzara; F., Natali; Bianconi, Antonio. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - STAMPA. - 14:25-27(2000), pp. 2852-2857. (Intervento presentato al convegno 10th National Congress on Superconductivity (SATT10)) tenutosi a FRASCATI, ITALY nel MAY 09-12, 2000) [10.1142/s0217979200003009].

Local structure of the charge ordered La0.5Ca0.5MnO3

SAINI, Naurang Lal;BIANCONI, Antonio
2000

Abstract

Local lattice of the charge ordered La0.5Ca0.5MnO3 has been studied by temperature dependent Mn K-edge x-ray absorption measurements, using fluorescence detection method, to explore how the local lattice distortions are associated with the charge ordering in this system. The x-ray absorption near edge structure (XANES) reveals an abrupt change in the local MnO6 octahedral geometry, across the charge ordering temperature. The extended x-ray absorption fine structure (EXAFS) analysis shows largely distorted MnO6 octahedra with coexisting Q(3)-type and Q(2)-type of Jahn=Teller (JT) modes at low temperature in the commensurate charge ordered phase. We find that small JT distortions persist also in the charge disordered phase at high temperature.
2000
01 Pubblicazione su rivista::01a Articolo in rivista
Local structure of the charge ordered La0.5Ca0.5MnO3 / S., Agrestini; Saini, Naurang Lal; A., Lanzara; F., Natali; Bianconi, Antonio. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - STAMPA. - 14:25-27(2000), pp. 2852-2857. (Intervento presentato al convegno 10th National Congress on Superconductivity (SATT10)) tenutosi a FRASCATI, ITALY nel MAY 09-12, 2000) [10.1142/s0217979200003009].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/255275
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