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arXiv 0906.2846cond-mat.str-el
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畸变Kagome晶格Volborthite中的Phase Diagram和自旋动力学

Phase Diagram and Spin Dynamics in Volborthite with a Distorted Kagome Lattice

M. Yoshida, M. Takigawa, H. Yoshida, Y. Okamoto, Z. Hiroi

摘要:

本文报道了一种高质量粉末样品Cu_3V_2O_7(OH)_2/2H_2O的~(51)V-NMR研究。在低于4.5 T的磁场中,自旋-晶格弛豫速率1/T1出现一个尖锐的峰,并伴有谱线展宽,表明在1 K附近发生了磁相变。低温阶段显示异常,如洛伦兹线形状,1/T1 propto T行为表明密集的低能量激发,和大的自旋回波衰减率1/T2指向异常缓慢的波动。另一个磁相出现在4.5 T以上,具有较少的异常光谱形状和动力学。

英文摘要:

We report 51V-NMR study on a high-quality powder sample of volborthite Cu3V2O7(OH)2/2H2O, a spin-1/2 Heisenberg antiferromagnet on a distorted kagome lattice formed by isosceles triangles. In the magnetic fields below 4.5 T, a sharp peak in the nuclear spin-lattice relaxation rate 1/T1 accompanied with line broadening revealed a magnetic transition near 1 K. The low temperature phase shows anomalies such as a Lorentzian line shape, a 1/T1 propto T behavior indicating dense low energy excitations, and a large spin-echo decay rate 1/T2 pointing to unusually slow fluctuations. Another magnetic phase appears above 4.5 T with less anomalous spectral shape and dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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