サイエンス記事
三軸分光器とTOF分光器を用いた圧力誘起量子相転移の中性子散乱研
2020 年 30 巻 3 号 p. 140-143
詳細
2020 年 30 巻 3 号 p. 140-143
A pressure-induced quantum phase transition in the triangular antiferromagnet CsFeCl3 has been studied by means of both triple-axis and time-of-flight neutron spectrometers. Inelastic neutron scattering experiments were performed to measure entire spin spectra through the transition and their pressure dependence. It is demonstrated that in the quantum disordered phase, the magnetic excitation is softened by applying pressures. A spin wave excitation is observed in the ordered phase. Calculation of the spin spectra proves that the transverse and longitudinal spin fluctuations are hybridized in the ordered state. In addition, it is found that the hybridization is remarkably enhanced near the quantum critical point.
