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  Anomalous local lattice disorder and distortion in A2Mo2O7 pyrochlores

Castellano, C., Berti, G., Rubio-Marcos, F., Lamura, G., Sanna, S., Salas-Colera, E., et al. (2017). Anomalous local lattice disorder and distortion in A2Mo2O7 pyrochlores. Journal of Alloys and Compounds, 723, 327-332. doi:10.1016/j.jallcom.2017.06.272.

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 Creators:
Castellano, C.1, Author
Berti, Giulia2, 3, Author           
Rubio-Marcos, F.4, Author
Lamura, G.5, Author
Sanna, S.6, Author
Salas-Colera, E.7, 8, Author
Brambilla, A.3, Author
Munoz-Noval, A.9, Author
Duò, L.3, Author
Demartin, F.1, Author
Affiliations:
1Dipartimento di Chimica, Università degli Studi di Milano, ia Golgi 19, 20133, Milano, Italy, ou_persistent22              
2Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
3Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133, Milano, Italy, ou_persistent22              
4Electroceramic Department, Instituto de Ceráamica y Vidrio, CSIC, Kelsen 5, 28049, Madrid, Spain, ou_persistent22              
5CNR-SPIN, corso Perrone 24, 16146, Genova, Italy, ou_persistent22              
6Department of Physics and Astronomy, University of Bologna, 40127, Bologna, Italy, ou_persistent22              
7Instituto de Ciencia de Materiales de Madrid, ICMM, CSIC, Sor Juana In es de la Cruz 3, 28049, Cantoblanc, Madrid, Spain, ou_persistent22              
8Spanish CRG BM25 SpLin, ESRF 71 Avenue des Martyrs CS 40220, FR - 38043, Grenoble, France, ou_persistent22              
9Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higahi-Hiroshima, Hiroshima, 739-8527, Japan, ou_persistent22              

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 Abstract: We present an extended X-ray absorption fine structure study of the pyrochlores A2Mo2O7 (A-Gd, Dy,Ho, Er), as a function of temperature. While in the three spin-glass compositions Dy2Mo2O7, Ho2Mo2O7and 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.

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 Dates: 2017-06-122017-04-122017-06-242017-06-242017-11-05
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jallcom.2017.06.272
 Degree: -

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Title: Journal of Alloys and Compounds
  Abbreviation : J. Alloy. Comp.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier B.V.
Pages: 6 Volume / Issue: 723 Sequence Number: - Start / End Page: 327 - 332 Identifier: ISSN: 0925-8388
CoNE: https://pure.mpg.de/cone/journals/resource/954925567746