论文标题
FCC抗fiferromagnet中的量子与热波动：通过无序有序的替代路线
Quantum versus thermal fluctuations in the fcc antiferromagnet: alternative routes to order by disorder
论文作者
论文摘要
在沮丧的磁系统中，相互作用的波动可以提高剩余的意外变性。我们认为，状态选择可能对量子和热秩序有不同的结果。例如，我们考虑仅与最近的邻居相互作用的半经典Heisenberg FCC抗铁磁铁。零点振荡在t = 0时选择3型截面抗铁磁状态。热波动有利于1型抗铁磁结构。相反的趋势导致两个共线状态之间的有限温度转变。量子和热序的影响之间的竞争是一种普遍的现象，在临界点J2 = 0.5 J1处的J1-J2 Square-lattice抗fiferromagnet中也实现了竞争。
In frustrated magnetic systems with competing interactions fluctuations can lift the residual accidental degeneracy. We argue that the state selection may have different outcomes for quantum and thermal order by disorder. As an example, we consider the semiclassical Heisenberg fcc antiferromagnet with only the nearest-neighbor interactions. Zero-point oscillations select the type 3 collinear antiferromagnetic state at T=0. Thermal fluctuations favor instead the type 1 antiferromagnetic structure. The opposite tendencies result in a finite-temperature transition between the two collinear states. Competition between effects of quantum and thermal order by disorder is a general phenomenon and is also realized in the J1-J2 square-lattice antiferromagnet at the critical point J2 = 0.5 J1.
