Evidence of local structural order and spin-lattice coupling in the frustrated pyrochlore ${\mathrm{Y}}_{2}{\mathrm{Ru}}_{2}{\mathrm{O}}_{7}$

Evidence of local structural order and spin-lattice coupling in the frustrated pyrochlore $Y_{2} {Ru}_{2} O_{7}$

C. Castellano, G. Berti, S. Sanna, R. Ruiz-Bustos, J. van Duijn, A. Brambilla, Á. Muñoz-Noval, P. Carretta, L. Duò, and F. Demartin

Phys. Rev. B 91, 224101 – Published 8 June 2015

Abstract

We present an extended x-ray absorption fine structure study of the pyrochlore $Y_{2} {Ru}_{2} O_{7}$ (8–298 K). We find evidence, on a local scale, of a significant magnetoelastic coupling at the Néel temperature $T_{N} \sim 77 K$ pointed out by a huge Debye-Waller $σ^{2}$ factor deviation from a correlated temperature dependent Debye-like local order behavior plus a temperature independent static contribution. Moreover, we notice the occurrence of a potential local order-disorder structural phase transition at $T^{*} = 150$ K. This anomalous behavior is consistent with the pyrochlore's predisposition towards structural disorder and with a strong spin-phonon correlation. Remarkably the low-temperature order competes with the tendency of magnetic frustration to induce a less symmetric local structure.

Received 23 February 2015
Revised 19 May 2015

DOI:https://doi.org/10.1103/PhysRevB.91.224101

Authors & Affiliations

C. Castellano^1,*, G. Berti², S. Sanna³, R. Ruiz-Bustos⁴, J. van Duijn⁵, A. Brambilla², Á. Muñoz-Noval⁶, P. Carretta³, L. Duò², and F. Demartin¹

¹Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy
²Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy
³Dipartimento di Fisica and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Università di Pavia, viale Bassi 6, 27100 Pavia, Italy
⁴Departamento de Mecánica, Universidad de Córdoba, Córdoba, 14071, Spain
⁵Instituto de Investigación en Energías Renovables, Departamento de Física Aplicada,Universidad de Castilla-La Mancha, Albacete, 02006, Spain
⁶Instituto de Ciencia de Materiales de Madrid-Consejo Superior de Investigaciones Cientificas (ICMM-CSIC) and Spanish Collaborating Research Group (CRG), European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38000 Grenoble, France

^*Corresponding author: carlo.castellano@unimi.it

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Vol. 91, Iss. 22 — 1 June 2015

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Physical Review B

covering condensed matter and materials physics

Evidence of local structural order and spin-lattice coupling in the frustrated pyrochlore $Y_{2} {Ru}_{2} O_{7}$

C. Castellano, G. Berti, S. Sanna, R. Ruiz-Bustos, J. van Duijn, A. Brambilla, Á. Muñoz-Noval, P. Carretta, L. Duò, and F. Demartin

Phys. Rev. B 91, 224101 – Published 8 June 2015

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Physical Review B

covering condensed matter and materials physics

Evidence of local structural order and spin-lattice coupling in the frustrated pyrochlore Y2Ru2O7

C. Castellano, G. Berti, S. Sanna, R. Ruiz-Bustos, J. van Duijn, A. Brambilla, Á. Muñoz-Noval, P. Carretta, L. Duò, and F. Demartin

Phys. Rev. B 91, 224101 – Published 8 June 2015

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Evidence of local structural order and spin-lattice coupling in the frustrated pyrochlore $Y_{2} {Ru}_{2} O_{7}$