Probing the quantum phase transitions in the triangular-lattice antiferromagnet Na2BaCo(PO4)2
S = 1/2 triangular-lattice antiferromagnet (TLAF) provides a fertile ground for unconventional quantum phases and phase transitions.Introducing an easy-axis spin exchange anisotropy to the TLAF results in the spin supersolid in zero magnetic field, while applying a magnetic field along the easy-axis drives the system through a sequence of quantum phase transitions by which the spin supersolidity disappears and then reemerges.Recently, the compound Na2BaCo(PO4)2 (NBCPO) with an ideal triangular lattice of Co2+ ions has caught much attention. It is theoretically found that the spin Hamiltonian of NBCPO can be well described by an easy-axis XXZ-type Heisenberg model. According to the established model, the NBCPO hosts a spin supersolid state. When the field is applied along the c axis, it will undergo successively the Y, Up-Up-Down, V, and the polarized phases with increasing field. The Y and V phase spontaneously break both the lattice translation symmetry and the spin rotational U(1) symmetry, thereby constituting the supersolid state. We propose to study the field-induced magnetic order and to check the spin supersolidity scenario in NBCPO by single-crystal neutron diffraction.
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The recommended format for citing this dataset in a research publication is in the following format:
JIN Wentao; SCHMIDT Wolfgang F; Yixi Su; ZHANG Chuandi and ZHOU Yishui. (2023). Probing the quantum phase transitions in the triangular-lattice antiferromagnet Na2BaCo(PO4)2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1193
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