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

被引：88

作者：

Yoshida, M. ^{[1
]}

Takigawa, M. ^{[1
]}

Yoshida, H. ^{[1
]}

Okamoto, Y. ^{[1
]}

Hiroi, Z. ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 07期

关键词：

NUCLEAR MAGNETIC-RELAXATION;

D O I：

10.1103/PhysRevLett.103.077207

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a V-51-NMR study on a high-quality powder sample of volborthite Cu3V2O7(OH)(2) center dot 2H(2)O, 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/T-1 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/T-1 alpha T behavior indicating dense low-energy excitations, and a large spin-echo decay rate 1/T-2 pointing to unusually slow fluctuations. Another magnetic phase appears above 4.5 T with less anomalous spectral shape and dynamics.

引用

页数：4

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