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Zhou, H D; Wiebe, C R; Jo, Y-J; Balicas, L; Urbano, R R; Lumata, L L; Brooks, J S; Kuhns, P L; Reyes, A P; Qiu, Y; Copley, J R D; Gardner, J S
Physical review letters, 02/2009, Letnik: 102, Številka: 6Journal Article
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.
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