Chemical Pressure Induced Spin Freezing Phase Transition in Kagome Pr Langasites Academic Article uri icon

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abstract

  • The 2D kagome system Pr3Ga5SiO14 has been previously identified as a spin-liquid candidate in zero field, displaying no magnetic long-ranged order down to at least 35 mK. Perturbations upon such systems, either under applied fields or applied pressure, should induce a spin freezing phase transition, but there are very few experimental realizations of this phenomena other than the well-studied 3D pyrochlore Tb2Ti2O7. In this Letter, we report the observation of a spin freezing phase transition in Pr3Ga5SiO14 through the application of chemical pressure--that is, through a systematic substitution on the Si site with larger ions and an elongation of the nearest-neighbor Pr-Pr distance in the kagome lattice. This results in a suppression of the T2 component of the heat capacity, and the reduction of the exchange constant eventually leads to dipolar-driven spin freezing.

authors

  • Zhou, HD
  • Wiebe, Christopher
  • Jo, Y-J
  • Balicas, L
  • Urbano, RR
  • Lumata, LL
  • Brooks, JS
  • Kuhns, PL
  • Reyes, AP
  • Qiu, Y
  • Copley, JRD
  • Gardner, JS

publication date

  • February 13, 2009