Structural Fluctuations in the Spin-Liquid State ofTb2Ti2O7 Academic Article uri icon

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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 approximately 20 K. Parametric studies of structural Bragg peaks appropriate to the Fd3[over ]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 approximately 18 K. These measurements are consistent with the development of fluctuations above a cooperative Jahn-Teller, cubic-tetragonal phase transition at very low temperatures.

authors

  • Ruff, JPC
  • Gaulin, Bruce D
  • Castellan, JP
  • Rule, KC
  • Clancy, JP
  • Rodriguez, J
  • Dabkowska, HA

publication date

  • December 7, 2007