Polarized neutron inelastic scattering study of the anisotropic magnetic fluctuations in quasi-one-dimensional ising-like antiferromagnet TlCoCl

擬一次元イジング的反強磁性物質TlCoClにおける異方的磁気励起の偏極中性子散乱研究

大沢 明*; 加倉井 和久; 西脇 洋一*; 加藤 徹也*

Osawa, Akira*; Kakurai, Kazuhisa; Nishiwaki, Yoichi*; Kato, Tetsuya*

擬一次元イジング的反強磁性物質TlCoClの偏極中性子非弾性散乱実験を行い、この系において従来の横揺らぎの成分S(Q,)に加え初めて連続スピン波励起の縦揺らぎS(Q,)の観測に成功した。この実験結果を石村・斯波による純イジング反強磁性鎖の理論結果と比較した。

Polarized neutron inelastic scattering experiments have been carried out in the quasi-1D Ising-like antiferromagnet TlCoCl. We observed the longitudinal magnetic fluctuation S(Q,) for the spin-wave excitation continuum for the first time, together with the transverse magnetic fluctuation S(Q,). We compared both obtained intensities of S(Q,) and S(Q,) with the predictions of the perturbation theory from the pure Ising limit by Ishimura and Shiba.