Manganese sites and valence states in RCu3-xMn 4+xO12(R = Ca or La) magnetoresistive perovskites

Sánchez-Benítez, J. and Pérez-Junquera, A. and Vila, M. and de Andrés, A. and Prieto, C. and Martínez, J.L. and Alonso, J.A. and Martínez-Lope, M.J. and Casais, M.T. and Ramos, Silvia (2005) Manganese sites and valence states in RCu3-xMn 4+xO12(R = Ca or La) magnetoresistive perovskites. 1st International Meeting on Applied Physics, APHYS-2003, T118 . pp. 251-254. ISSN 0281-1847. (doi:https://doi.org/10.1238/Physica.Topical.118a00251) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
https://doi.org/10.1238/Physica.Topical.118a00251

Abstract

The manganese environment has been investigated by X-ray Absorption Spectroscopy (XAS) in RCu3-xMn4+xO12(R = Ca or La) magnetoresistive perovskites. The analysis of the data evidence the presence of two different Mn edges, each one related with the two different sites in which Mn can be located. Mn-O distances at both sublattices were obtained by Extended X-ray Absorption Fine Structure (EXAFS) analysis. The variation of the threshold energy corresponding to the Mn at A sites is driven by the changes in the Mn-O distances. On the contrary, the edge of Mn at Mn-O6 sites, which is equivalent to the one observed in manganites, is dominated by the change in its valence. The results suggest that electrical conduction in this series of compounds is due to the Mn eg electrons at B site (mixed valence Mn) and not to the localized electrons from Mn at A site of the perovskite. © Physica Scripta 2005.

Item Type: Article
Uncontrolled keywords: Extended X ray absorption fine structure spectroscopy, Magnetoresistance, Manganites, Valence bands, X ray absorption spectroscopy, Magnetoresistive perovskites, Manganese environment, Threshold energy, Valence states, Perovskite
Subjects: Q Science > QC Physics > QC176 Solid state physics
Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Silvia Ramos
Date Deposited: 05 Dec 2017 23:03 UTC
Last Modified: 10 Dec 2017 22:20 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46999 (The current URI for this page, for reference purposes)
Ramos, Silvia: https://orcid.org/0000-0003-2725-7706
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