Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2
| Autor: | P. Gao, E. S. Choi, Q. Huang, X. Zhao, A. Brassington, Q. J. Li, Huibo Cao, X. F. Sun, Erxi Feng, W. J. Chu, X. H. Zhou, Haidong Zhou, S. K. Guang, X. Y. Yue, Yan Sun, N. Li |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review B. 104 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We have grown single crystals of ${\mathrm{Na}}_{2}\mathrm{BaNi}{({\mathrm{PO}}_{4})}_{2}$, a spin-1 equilateral triangular lattice antiferromagnet (ETLAF), and performed magnetic susceptibility, specific heat, and thermal conductivity measurements at ultralow temperatures. The main results are as follows: (i) At zero magnetic field, ${\mathrm{Na}}_{2}\mathrm{BaNi}{({\mathrm{PO}}_{4})}_{2}$ exhibits a magnetic ordering at 430 mK with a weak ferromagnetic moment along the $c$ axis. This suggests a canted ${120}^{\ensuremath{\circ}}$ spin structure, which is in a plane including the crystallographic $c$ axis due to the existence of an easy-axis anisotropy and ferromagnetically stacked along the $c$ axis. (ii) With increasing field along the $c$ axis, a 1/3 magnetization plateau is observed, which means that the canted ${120}^{\ensuremath{\circ}}$ spin structure is transformed into an up-up-down (UUD) spin structure. With even higher fields, the UUD phase further evolves into possible V and ${\mathrm{V}}^{\ensuremath{'}}$ phases. (iii) With increasing field along the $a$ axis, the canted ${120}^{\ensuremath{\circ}}$ spin structure is possibly transformed into an umbrella phase and a V phase. Therefore ${\mathrm{Na}}_{2}\mathrm{BaNi}{({\mathrm{PO}}_{4})}_{2}$ is a rare example of a spin-1 ETLAF with single-crystalline form that exhibits easy-axis spin anisotropy and a series of quantum spin state transitions. |
| Databáze: | OpenAIRE |
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