论文标题
Berezinsky-Kosterlitz的签名 - 平面抗fiferromagnet bani $ _2 $ v $ _2 $ o $ $ _8 $
Signatures for Berezinsky-Kosterlitz-Thouless critical behaviour in the planar antiferromagnet BaNi$_2$V$_2$O$_8$
论文作者
论文摘要
我们研究了旋转的关键特性-1 $ honeycomb antiferromagnet bani $ _2 $ v $ _2 $ o $ $ _8 $，均低于和高于订购温度$ t_n $，使用中子衍射和MUON旋转旋转测量值。我们的结果将BANI $ _2 $ v $ _2 $ o $ _8 $描述为整个温度范围内的二维（2D）反铁磁铁，显示出一系列从2D ISING型XY到2D XY，然后到2D Heisenberg行为，温度升高。特别是，该顺序参数的提取的临界指数显示，狭窄的温度状态接近$ t_n $，其中系统的行为作为2D XY抗FiferRomagnet。在$ t_n $上方，从相关长度的缩放范围获得了由涡流激发驱动的Berezinsky-Kosterlitz-由涡流激发驱动的无与伦比的行为。我们的实验结果与针对Bani的微观磁性模型进行的经典和量子蒙特卡洛模拟一致，bani $ _2 $ v $ _2 $ o $ $ _8 $。
We investigate the critical properties of the spin-$1$ honeycomb antiferromagnet BaNi$_2$V$_2$O$_8$, both below and above the ordering temperature $T_N$ using neutron diffraction and muon spin rotation measurements. Our results characterize BaNi$_2$V$_2$O$_8$ as a two-dimensional (2D) antiferromagnet across the entire temperature range, displaying a series of crossovers from 2D Ising-like to 2D XY 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 Berezinsky-Kosterlitz-Thouless behavior driven by vortex excitations is obtained from the scaling of the correlation length. Our experimental results are in accord with classical and quantum Monte Carlo simulations performed for microscopic magnetic model Hamiltonians for BaNi$_2$V$_2$O$_8$.
