Year: 2008
Type: article
Abstract: We report neutron-scattering studies of the spin correlations of the geometrically frustrated pyrochlore ${\text{Tb}}_{2}{\text{Mo}}_{2}{\text{O}}_{7}$ using single-crystal samples. This material undergoes a spin-freezing transition below ${T}_{g}\ensuremath{\simeq}24\text{ }\text{K}$, similar to ${\text{Y}}_{2}{\text{Mo}}_{2}{\text{O}}_{7}$, and has little apparent chemical disorder. Diffuse elastic peaks are observed at low temperatures, indicating short-range ordering of the Tb moments in an arrangement where the Tb moments are slightly rotated from the preferred directions of the spin-ice structure. In addition, a $\stackrel{P\vec}{Q}$-independent signal is observed which likely originates from frozen but completely uncorrelated Tb moments. Inelastic measurements show the absence of sharp peaks due to crystal-field excitations. These data show how the physics of the Tb sublattice responds to the glassy behavior of the Mo sublattice with the associated effects of lattice disorder.
Source: Physical Review B
Authors: D. K. Singh, J. S. Helton, S. Chu, T. H. Han, C. J. Bonnoit, S. Chang, H. J. Kang, J. W. Lynn, Y. S. Lee
Language: Latvian
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2092987365