Spin supersolidity in nearly ideal easy-axis triangular quantum antiferromagnet Na2BaCo(PO4)2

Author:

Gao YuanORCID,Fan Yu-Chen,Li HanORCID,Yang FanORCID,Zeng Xu-Tao,Sheng Xian-LeiORCID,Zhong Ruidan,Qi YangORCID,Wan YuanORCID,Li WeiORCID

Abstract

AbstractPrototypical models and their material incarnations are cornerstones to the understanding of quantum magnetism. Here we show theoretically that the recently synthesized magnetic compound Na2BaCo(PO4)2 (NBCP) is a rare, nearly ideal material realization of the S = 1/2 triangular-lattice antiferromagnet with significant easy-axis spin exchange anisotropy. By combining the automatic parameter searching and tensor-network simulations, we establish a microscopic model description of this material with realistic model parameters, which can not only fit well the experimental thermodynamic data but also reproduce the measured magnetization curves without further adjustment of parameters. According to the established model, the NBCP hosts a spin supersolid state that breaks both the lattice translation symmetry and the spin rotational symmetry. Such a state is a spin analog of the long-sought supersolid state, thought to exist in solid Helium and optical lattice systems, and share similar traits. The NBCP therefore represents an ideal material-based platform to explore the physics of supersolidity as well as its quantum and thermal melting.

Funder

National Natural Science Foundation of China

Publisher

Springer Science and Business Media LLC

Subject

Condensed Matter Physics,Electronic, Optical and Magnetic Materials

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