S=1/2 Kagome antiferromagnets Cs$_2$Cu$_3MF$_{12}$ with M=Zr and Hf

Y. Yamabe; T. Ono; T. Suto; H. Tanaka

doi:10.1088/0953-8984/19/14/145253

paper

S=1/2 Kagome antiferromagnets Cs $_{2}$ Cu $_{3} M F$ _{12}$ with M=Zr and Hf

arXiv:cond-mat/0607440 · doi:10.1088/0953-8984/19/14/145253

Abstract

Magnetization and specific heat measurements have been carried out on Cs $_{2}$ Cu $_{3}$ ZrF $_{12}$ and Cs $_{2}$ Cu $_{3}$ HfF $_{12}$ single crystals, in which Cu $^{2 +}$ ions with spin-1/2 form a regular Kagomé lattice. The antiferromagnetic exchange interaction between neighboring Cu $^{2 +}$ spins is $J / k_{B} ≃ 360$ K and 540 K for Cs $_{2}$ Cu $_{3}$ ZrF $_{12}$ and Cs $_{2}$ Cu $_{3}$ HfF $_{12}$ , respectively. Structural phase transitions were observed at $T_{t} ≃ 210$ K and 175 K for Cs $_{2}$ Cu $_{3}$ ZrF $_{12}$ and Cs $_{2}$ Cu $_{3}$ HfF $_{12}$ , respectively. The specific heat shows a small bend anomaly indicative of magnetic ordering at $T_{N} = 23.5$ K and 24.5 K in Cs $_{2}$ Cu $_{3}$ ZrF $_{12}$ and Cs $_{2}$ Cu $_{3}$ HfF $_{12}$ , respectively. Weak ferromagnetic behavior was observed below $T_{N}$ . This weak ferromagnetism should be ascribed to the antisymmetric interaction of the Dzyaloshinsky-Moriya type that are generally allowed in the Kagomé lattice.

6 pages, 4 figure. Conference proceeding of Highly Frustrated Magnetism 2006

S=1/2 Kagome antiferromagnets Cs2​Cu3​MF_{12}$ with M=Zr and Hf

Abstract

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S=1/2 Kagome antiferromagnets Cs $_{2}$ Cu $_{3} M F$ _{12}$ with M=Zr and Hf