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

doi:10.1103/PhysRevLett.99.237202

Structural Fluctuations in the Spin Liquid State of Tb2Ti2O7

Disordered Systems and Neural Networks 2009-11-13 v1 Statistical Mechanics

Authors: 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.

Keywords

magnetic materials and spin systems crystal growth and phase transitions phase transitions

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@article{arxiv.0707.1682,
  title  = {Structural Fluctuations in the Spin Liquid State of Tb2Ti2O7},
  author = {J. P. C. Ruff and B. D. Gaulin and J. P. Castellan and K. C. Rule and J. P. Clancy and J. Rodriguez and H. A. Dabkowska},
  journal= {arXiv preprint arXiv:0707.1682},
  year   = {2009}
}

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5 pages, 4 figures, submitted for publication

Structural Fluctuations in the Spin Liquid State of Tb2Ti2O7

Abstract

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