期刊
PHYSICAL REVIEW B
卷 104, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.064402
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) through project B06 of SFB 1143: Correlated Magnetism: From Frustration To Topology [247310070]
- Swedish Research Council (VR) through a Neutron Project Grant [2016-06955]
- Swedish Foundation for Strategic Research (SSF) within the Swedish national graduate school in neutron scattering (SwedNess)
- Deutsche Forschungsgemeinschaft [WE/3649/4-2, FOR 1807, RTG 1995]
The study revealed that BaNi2V2O8 behaves as a two-dimensional antiferromagnet across the entire temperature range, with different behavior patterns emerging as the temperature increases. Close to the ordering temperature TN, the system behaves as a 2D XY antiferromagnet, while above TN, evidence of Berezinskii-Kosterlitz-Thouless behavior driven by vortex excitations was observed.
We investigate the critical properties of the spin-1 honeycomb antiferromagnet BaNi2V2O8, both below and above the ordering temperature T-N using neutron diffraction and muon spin rotation measurements. Our results characterize BaNi2V2O8 as a two-dimensional (2D) antiferromagnet across the entire temperature range, displaying a series of crossovers from 2D XY to 2D XXZ and then to 2D Heisenberg behavior with increasing temperature. In particular, the extracted critical exponent of the order parameter reveals a narrow temperature regime close to T-N, in which the system behaves as a 2D XY antiferromagnet. Above T-N, evidence for Berezinskii-Kosterlitz-Thouless behavior driven by vortex excitations is obtained from the scaling of the correlation length. Our experimental results are in agreement with classical and quantum Monte Carlo simulations performed using microscopic magnetic model Hamiltonians for BaNi2V2O8.
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