TY - JOUR
T1 - Spin dynamics of triangular lattice antiferromagnet CuFeO2
T2 - Crossover from spin-liquid to paramagnetic phase
AU - Hayashi, Kei
AU - Nozaki, Tomohiro
AU - Fukatsu, R.
AU - Miyazaki, Yuzuru
AU - Kajitani, T.
PY - 2009/10/19
Y1 - 2009/10/19
N2 - 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 Néel 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.
AB - 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 Néel 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.
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U2 - 10.1103/PhysRevB.80.144413
DO - 10.1103/PhysRevB.80.144413
M3 - Article
AN - SCOPUS:71449091157
VL - 80
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 14
M1 - 144413
ER -