Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2007-07-11
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages, 4 figures, submitted for publication
Scientific paper
10.1103/PhysRevLett.99.237202
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.
Castellan John-Paul
Clancy J. P.
Dabkowska Hanna A.
Gaulin Bruce D.
Rodríguez Jacquelin
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