在100特斯拉下观察到的自旋二聚体系统TlCuCl₃中的粒子-空穴对称性破缺

Particle-Hole Symmetry Breaking in a Spin-Dimer System TlCuCl_{3} Observed at 100 T.

作者信息

Zhou X-G, Yao Yuan, Matsuda Y H, Ikeda A, Matsuo A, Kindo K, Tanaka H

机构信息

Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.

出版信息

Phys Rev Lett. 2020 Dec 31;125(26):267207. doi: 10.1103/PhysRevLett.125.267207.

DOI:10.1103/PhysRevLett.125.267207

PMID:33449724

Abstract

The entire magnetization process of TlCuCl_{3} has been experimentally investigated up to 100 T employing the single-turn technique. The upper critical field H_{c2} is observed to be 86.1 T at 2 K. A convex slope of the M-H curve between the lower and upper critical fields (H_{c1} and H_{c2}) is clearly observed, which indicates that a particle-hole symmetry is broken in TlCuCl_{3}. By quantum Monte Carlo simulation and the bond-operator theory method, we find that the particle-hole symmetry breaking results from strong interdimer interactions.

摘要

利用单圈技术对TlCuCl₃的整个磁化过程进行了高达100 T的实验研究。在2 K时观察到上临界场Hₑ₂为86.1 T。在下临界场和上临界场（Hₑ₁和Hₑ₂）之间的M-H曲线明显观察到凸斜率，这表明TlCuCl₃中的粒子-空穴对称性被打破。通过量子蒙特卡罗模拟和键算子理论方法，我们发现粒子-空穴对称性的破坏源于强二聚体间相互作用。