Spin dynamics of triangular lattice antiferromagnet CuFeO2: Crossover from spin-liquid to paramagnetic phase

被引：21

作者：

Hayashi, K. ^{[1
]}

Nozaki, T. ^{[1
]}

Fukatsu, R. ^{[1
]}

Miyazaki, Y. ^{[1
]}

Kajitani, T. ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai, Miyagi 9808579, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 14期

关键词：

PARTIALLY DISORDERED PHASE; MAGNETIC-PROPERTIES; HEISENBERG-ANTIFERROMAGNET; PYROCHLORE ANTIFERROMAGNET; STATE PROPERTIES; EXACT SPECTRA; NEEL ORDER; DELAFOSSITE; MODEL; TRANSITIONS;

D O I：

10.1103/PhysRevB.80.144413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the spin dynamics of triangular lattice antiferromagnet CuFeO2 by measuring powder neutron inelastic-scattering spectra. A quasielastic component whose half-width oscillates with the magnitude of the scattering vector appears in the spectra above Neel temperature. A dynamics model representing the shape of quasielastic components and oscillatory behaviors changes from spin jump diffusion to Heisenberg paramagnetic (PM) scattering with increasing temperature. These findings demonstrate that CuFeO2 shows a gradual transition from a spin-liquid phase to the Heisenberg PM phase. The origin of the spin-liquid phase is discussed in terms of incommensurate short-range spin correlation.

引用

页数：5

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