Substitution site and effects on magnetism in Sr-for-Ca substituted CaBaCo4O7
Resumen: Cationic substitutions in the novel magnetoelectric compound CaBaCo4O7 lead to profound changes in its magnetic and electric behaviors. In this work, we present a structural study of the isovalent substitution Sr-for-Ca in CaBaCo4O7. X-ray diffraction, as well as neutron powder diffraction experiments, are reported for a series of samples Ca1- xSrxBaCo4O7 with 0 = x = 0.10. Special emphasis is given to the identification of the substitution site, as Sr has also been reported to substitute for Ba in this crystal structure. The solubility limit for Sr at the Ca site is shown to be at x ¿ 0.08. The variation of lattice constants with Sr-doping firmly supports the Sr-for-Ca substitution. Rietveld refinements of the Sr-substituted samples are presented, and used as starting point to analyse the local structure around Sr by means of X-ray absorption spectroscopy at the Sr K-edge. Both the near-edge absorption and the extended absorption fine-structure confirm the substitution of Sr for Ca, giving definite support to the proposed nominal formula. In addition, macroscopic magnetization measurements are presented which reveal the striking effects of Sr-substitution over the magnetic landscape of this puzzling compound.
Idioma: Inglés
DOI: 10.1063/1.4931615
Año: 2015
Publicado en: Journal of Applied Physics 118 (2015), 134101
ISSN: 0021-8979

Factor impacto JCR: 2.101 (2015)
Categ. JCR: PHYSICS, APPLIED rank: 47 / 145 = 0.324 (2015) - Q2 - T1
Factor impacto SCIMAGO: 0.821 - Physics and Astronomy (miscellaneous) (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2011-27233-C02-02
Tipo y forma: Article (PostPrint)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)

Creative Commons You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. If you remix, transform, or build upon the material, you may not distribute the modified material.

Exportado de SIDERAL (2021-01-21-10:58:59)

Este artículo se encuentra en las siguientes colecciones:

 Record created 2015-12-23, last modified 2021-01-21

Rate this document:

Rate this document:
(Not yet reviewed)