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Quantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet Na2BaNi(PO4)2

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [1];  [1];  [1];  [1];  [4];  [4];  [5];  [3];  [3];  [1];  [2];  [6]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Anhui University, Hefei (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  6. 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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