Order and Disorder in the Local and Long-Range Structure of the Spin-Glass Pyrochlore, Tb2Mo2Od7^

Published

April 27, 2011

Author(s)

Yu Jiang, Ashfia Huq, Corwin H. Booth, Georg Ehlers, John E. Greedan, Jason S. Gardner

Abstract

To understand the origin of the spin-glass state in molybdate pyrochlores, the structure of Tb₂Mo₂O₇ is investigated using two techniques: the long-range lattice structure was measured using neutron powder diffraction (NPD), and the local structure information was obtained from extended x-ray absorption fine structure (EXAFS) measurements. While the long-range structure appears well ordered, enhanced mean-squared site displacements on the Mo and O(1) sites indicate some disorder exists. Likewise, the local structure measurements indicate nearest-neighbor disorder exists, similar to that found in the related spin-glass pyrochlore, Y₂Mo₂O₇. Although the freezing temperature in Tb₂Mo₂O₇, 25 K, is slightly higher than in Y₂Mo₂O₇, 22 K, the degree of local bond disorder is actually less in Tb₂Mo₂O₇. This apparaent contradiction is considered in light of the interactions involved in the freezing process.

Citation

Journal of Physics Condensed Matter

Volume

23

Pub Type

Journals

Download Paper

Local Download

Keywords

EXAFS, Tb2Mo2O7, spin glass

Citation

Jiang, Y. , Huq, A. , Booth, C. , Ehlers, G. , Greedan, J. and Gardner, J. (2011), Order and Disorder in the Local and Long-Range Structure of the Spin-Glass Pyrochlore, Tb₂Mo_2Od7^, Journal of Physics Condensed Matter, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=907639 (Accessed April 19, 2024)