1. Field-Induced Quantum Phase Transitions in the Pressure-Tuned Triangular-Lattice Antiferromagnet CsCuCl3.
- Author
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Nihongi, Katsuki, Kida, Takanori, Yamamoto, Daisuke, Narumi, Yasuo, Zaccaro, Julien, Kousaka, Yusuke, Inoue, Katsuya, Uwatoko, Yoshiya, Kindo, Koichi, and Hagiwara, Masayuki
- Abstract
We present the phase diagram of magnetic field vs pressure for a triangular-lattice antiferromagnet CsCuCl
3 surpassing the saturation field constructed by the magnetic-susceptibility measurements in pulsed magnetic fields of up to 55 T under pressures of up to 2.08 GPa. Up–up–down (UUD) and Y-coplanar phases were observed above 0.70 and 1.79 GPa, respectively. Based on theoretical calculations using the 1/S expansion method for the pressure dependence of the transition fields, we determined the parameters of the intrachain and interchain exchange interactions and easy-plane anisotropy. The emergence of the UUD and Y-coplanar phases is accompanied by a crossover from the semi-classical to the quantum spin regime in CsCuCl3 , which is caused by a significant decrease in the ratio of intra- to interchain exchange interactions with increasing pressure. The temperature dependence of the magnetic phases at 2.08 GPa indicates that thermal fluctuations stabilized the UUD phase more effectively than the Y-coplanar and umbrella phases. [ABSTRACT FROM AUTHOR]- Published
- 2024
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