Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2
Journal Article
·
· Physical Review. B
- Univ. of Science and Technology of China, Hefei (China)
- Univ. of Tennessee, Knoxville, TN (United States)
- Anhui University, Hefei (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Univ. of Science and Technology of China, Hefei (China); Anhui University, Hefei (China); Nanjing Univ. (China)
We report we have grown single crystals of Na2BaNi(PO4)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, Na2BaNi(PO4)2 exhibits a magnetic ordering at 430 mK with a weak ferromagnetic moment along the $$\textit{c}$$ axis. This suggests a canted 120° spin structure, which is in a plane including the crystallographic $$\textit{c}$$ axis due to the existence of an easy-axis anisotropy and ferromagnetically stacked along the $$\textit{c}$$ axis. (ii) With increasing field along the $$\textit{c}$$ axis, a 1/3 magnetization plateau is observed, which means that the canted 120° 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 V' phases. (iii) With increasing field along the $$\textit{a}$$ axis, the canted 120° spin structure is possibly transformed into an umbrella phase and a V phase. Therefore Na2BaNi(PO4)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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Chinese Academy of Sciences (CAS); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); Natural Science Foundation of Anhui Province; State of Florida; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1883746
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 104; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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