Anomalous local lattice disorder and distortion in A2Mo2O7 pyrochlores

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Show simple item record Castellano, Carlo Berti, Giulia Rubio Marcos, Fernando Lamura, G. Sanna, Samuele Salas Colera, Eduardo Brambilla, Alberto Muñoz Noval, A. Duo, L. Demartin, Francesco 2022-09-16T10:10:06Z 2022-09-16T10:10:06Z 2017-11-05
dc.identifier.bibliographicCitation Castellano, C., Berti, G., Rubio-Marcos, F., Lamura, G., Sanna, S., Salas-Colera, E., Brambilla, A., Muñoz-Noval, Á., Duò, L., & Demartin, F. (2017). Anomalous local lattice disorder and distortion in A2Mo2O7 pyrochlores. In Journal of Alloys and Compounds, 723, 327–332
dc.identifier.issn 0925-8388
dc.description.abstract We present an extended X-ray absorption fine structure study of the pyrochlores A2Mo2O7 (A ¼ Gd, Dy, Ho, Er), as a function of temperature. While in the three spin-glass compositions Dy2Mo2O7, Ho2Mo2O7 and Er2Mo2O7 the Debye temperatures are in accordance with other pyrochlores and the static disorder contributions are compatible with a lattice frustration, in the low-temperature-ferromagnetic Gd2Mo2O7 system we point out an anomalous enhancement of the local structure disorder below about 225 K down to low temperatures. Moreover, considering the general pyrochlore predisposition towards structural disorder, we prove the presence on a local scale of at least a bimodal distribution of the Mo-O(1) octahedral interatomic distances for all the studied compounds, consisting of two shorter and four longer bond lengths. Our results suggest that the local structure order parameter plays an important role in the ferromagnetic or spin-glass phase stabilization.
dc.description.sponsorship We gratefully acknowledge the Spanish CRG at the ESRF for providing beamtime under experiment HC-2414. F.R.-M. is also indebted to MINECO for a ‘Ramon y Cajal’ contract (ref: RyC-2015- 18626), which is co-financed by the European Social Fund 2014-20. G.L. thanks M. Lucaccini and G. Tavilla for their valuable technical support and C. Robustelli for the supply of cryogenic liquids during the magnetization measurements.
dc.format.extent 5
dc.language.iso eng
dc.publisher ELSEVIER BV
dc.rights © 2017 Elsevier B.V. All rights reserved
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.subject.other A. oxide materials
dc.subject.other A. pyrochlores
dc.subject.other C. order-disorder effects
dc.subject.other D. exafs
dc.title Anomalous local lattice disorder and distortion in A2Mo2O7 pyrochlores
dc.type research article
dc.subject.eciencia Física
dc.rights.accessRights open access
dc.relation.projectID Gobierno de España. RyC-2015- 18626
dc.identifier.publicationfirstpage 327
dc.identifier.publicationlastpage 332
dc.identifier.publicationtitle JOURNAL OF ALLOYS AND COMPOUNDS
dc.identifier.publicationvolume 723
dc.identifier.uxxi AR/0000027042
dc.contributor.funder Ministerio de Economía y Competitividad (España)
dc.affiliation.dpto UC3M. Departamento de Física
dc.type.hasVersion AM
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