Spin correlations in the geometrically frustrated pyrochlore Tb₂Mo₂O₇

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D. K. Singh,¹ J. S. Helton,¹ S. Chu,² T. H. Han,¹ C. J. Bonnoit,¹ S. Chang,^3,4 H. J. Kang,^3,4 J. W. Lynn,³ and Y. S. Lee¹
¹Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
²Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
³NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA
⁴Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

Received 20 October 2008; published 31 December 2008

Wereport neutron-scattering studies of the spin correlations of the geometricallyfrustrated pyrochlore Tb₂Mo₂O₇ using single-crystal samples. This material undergoes aspin-freezing transition below T_g24 K, similar to Y₂Mo₂O₇, and has littleapparent chemical disorder. Diffuse elastic peaks are observed at lowtemperatures, indicating short-range ordering of the Tb moments in anarrangement where the Tb moments are slightly rotated from thepreferred directions of the spin-ice structure. In addition, a Q-vector -independentsignal is observed which likely originates from frozen but completelyuncorrelated Tb moments. Inelastic measurements show the absence of sharppeaks due to crystal-field excitations. These data show how thephysics of the Tb sublattice responds to the glassy behaviorof the Mo sublattice with the associated effects of latticedisorder.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.78.220405
DOI:	10.1103/PhysRevB.78.220405
PACS:	75.25.+z; 75.40.Gb; 75.50.Lk; 78.70.Nx 75.25.+z Spin arrangements in magnetically ordered materials 75.40.Gb Dynamic properties of magnetic materials 75.50.Lk Spin glasses and other random magnets 78.70.Nx Neutron inelastic scattering (condensed matter) YEAR: 2008
KEYWORDS:	crystal field interactions, crystal structure, frustration, magnetic moments, magnetic structure, magnetic transitions, short-range order, spin glasses, terbium compounds

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