Details

Autor(en) / Beteiligte

• 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

Titel

Chemical pressure induced spin freezing phase transition in kagome pr langasites

Ist Teil von

• Physical review letters, 2009-02, Vol.102 (6), p.067203-067203, Article 067203

Ort / Verlag

United States

Erscheinungsjahr

2009

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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.