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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2019, Volume 109, Issue 8, Pages 540–546
DOI: https://doi.org/10.1134/S0370274X19080095 (Mi jetpl5880) 		 
This article is cited in 7 scientific papers (total in 7 papers)

CONDENSED MATTER

Local disorder in Ln$_2$Ti$_2$O$_7$ (Ln = Gd, Tb, Dy) pyrochlores

A. P. Menushenkova, V. V. Popovab, B. R. Gaynanova, A. A. Ivanova, A. V. Kuznetsova, A. A. Yaroslavtsevca, F. d’Acapitod, A. Purid

a National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia
b National Research Center Kurchatov Institute, Moscow, Russia
c European X-Ray Free-Electron Laser Facility GmbH, Schenefeld, Germany
d Consiglio Nazionale delle Ricerche – Istituto Officina dei Materiali – Operative Group in Grenoble at European Synchrotron Radiation Facility, Linea Italiana per la Spettroscopia d’Assorbimento Collaborating Research Groups, Grenoble, France
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DOI: https://doi.org/10.1134/S0370274X19080095
Abstract: The temperature dependences of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectra of Ln$_2$Ti$_2$O$_7$ (Ln = Gd, Tb, Dy) geometrically frustrated magnets with a pyrochlore structure are presented. The temperature dependences of the Ln-O and Ti-O interatomic bond lengths and Debye-Waller factors $\sigma^2$ characterizing the local static and dynamic disordering of bonds have been obtained in the temperature range of $10$–$300$ K. The stiffnesses of metal-oxygen bonds and the parameters of local disordering of the structure have been determined from the dependences $\sigma^2(T)$. The effect of the magnetic state of rare-earth ions on local features of the Ln$_2$Ti$_2$O$_7$ (Ln = Gd, Tb, Dy) structure has been described. The characteristics of local disorder in pyrochlores under study have been compared to dysprosium zirconate Dy$_2$Zr$_2$O$_7$ having a disordered fluorite structure.
Funding agency Grant number
Russian Science Foundation 18-12-00133
Received: 20.02.2019
Revised: 20.02.2019
Accepted: 07.03.2019
English version:
Journal of Experimental and Theoretical Physics Letters, 2019, Volume 109, Issue 8, Pages 529–535
DOI: https://doi.org/10.1134/S0021364019080095
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: A. P. Menushenkov, V. V. Popov, B. R. Gaynanov, A. A. Ivanov, A. V. Kuznetsov, A. A. Yaroslavtsev, F. d’Acapito, A. Puri, “Local disorder in Ln$_2$Ti$_2$O$_7$ (Ln = Gd, Tb, Dy) pyrochlores”, Pis'ma v Zh. Èksper. Teoret. Fiz., 109:8 (2019), 540–546; JETP Letters, 109:8 (2019), 529–535
Citation in format AMSBIB
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