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arXiv · 0707.1682

Structural Fluctuations in the Spin Liquid State of Tb2Ti2O7

J. P. C. Ruff·B. D. Gaulin·J. P. Castellan·K. C. Rule·J. P. Clancy·J. Rodriguez·H. A. Dabkowska
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Abstract

High resolution X-ray scattering measurements on single crystal Tb2Ti2O7 reveal finite structural correlations at low temperatures. This geometrically frustrated pyrochlore is known to exhibit a spin liquid, or cooperative paramagnetic state, at temperatures below ~ 20 K. Parametric studies of structural Bragg peaks appropriate to the Fd$\bar{3}$m space group of Tb2Ti2O7 reveal substantial broadening and peak intensity reduction in the temperature regime 20 K to 300 mK. We also observe a small, anomalous lattice expansion on cooling below a density maximum at ~ 18 K. These measurements are consistent with the development of fluctuations above a cooperative Jahn-Teller, cubic-tetragonal phase transition at very low temperatures.

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J. P. C. Ruff, B. D. Gaulin, J. P. Castellan, K. C. Rule, J. P. Clancy, J. Rodriguez, H. A. Dabkowska. 2007-07-11. Structural Fluctuations in the Spin Liquid State of Tb2Ti2O7. https://doi.org/10.1103/physrevlett.99.237202

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