Sánchez-Benítez, J., Pérez-Junquera, A., Vila, M., de Andrés, A., Prieto, C., Martínez, J.L., Alonso, J.A., Martínez-Lope, M.J., Casais, M.T., Ramos, Silvia and others. (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: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) (KAR id:46999)
| 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. | |
| 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 |
|---|---|
| DOI/Identification number: | 10.1238/Physica.Topical.118a00251 |
| Uncontrolled keywords: | Physics of Quantum Materials, 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: | Divisions > Division of Natural Sciences > Physics and Astronomy |
| Depositing User: | Silvia Ramos Perez |
| Date Deposited: | 05 Dec 2017 23:03 UTC |
| Last Modified: | 16 Nov 2021 10:19 UTC |
| Resource URI: | https://kar.kent.ac.uk/id/eprint/46999 (The current URI for this page, for reference purposes) |
University of Kent Author Information
Ramos, Silvia.
| Creator's ORCID: |
 https://orcid.org/0000-0003-2725-7706
|
|---|---|
| CReDIT Contributor Roles: |
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