Melting of Three-Sublattice Order in Easy-Axis Antiferromagnets on Triangular and Kagome Lattices
Melting of Three-Sublattice Order in Easy-Axis Antiferromagnets on Triangular and Kagome Lattices
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DOI：
10.1103/physrevlett.115.127204
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发表时间：
2015-09-16
影响因子：
8.6
通讯作者：
Damle, Kedar
中科院分区：
文献类型：
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作者：
Damle, Kedar
当组成自旋有一个充满活力的偏好，位于沿着一个易轴，三角形和kagome晶格反铁磁体往往发展长程秩序，区分底层三角形布拉维晶格的三个子晶格。在零磁场中，这种三亚晶格有序以两步方式熔化，即，通过具有由温度依赖指数eta（T）控制的幂律三次晶格序的中间相，或者通过三态Potts普适类中的跃迁，η（T）是（1/9，1/4）的元素。在这里，我预测的均匀磁化率小易轴场B发散作为chi（B）类似于垂直酒吧B垂直酒吧（-[4-18 η）/（4-9 η）]）在大部分的中间幂律有序相[对应于η（T）是一个元素（1/9，2/9）]，提供了一个易于测量的两步熔化的热力学特征。我还表明，这两个融化的情况下，可以通过一个干预多临界点，并获得多临界指数的数值估计一般连接。
When the constituent spins have an energetic preference to lie along an easy axis, triangular and kagome lattice antiferromagnets often develop long-range order that distinguishes the three sublattices of the underlying triangular Bravais lattice. In zero magnetic field, this three-sublattice order melts either in a two-step manner, i.e., via an intermediate phase with power-law three-sublattice order controlled by a temperature-dependent exponent eta(T) is an element of(1/9, 1/4), or via a transition in the three-state Potts universality class. Here, I predict that the uniform susceptibility to a small easy-axis field B diverges as chi(B) similar to vertical bar B vertical bar(-[4-18 eta)/(4-9 eta)]) in a large part of the intermediate power-law ordered phase [corresponding to eta(T) is an element of (1/9, 2/9)], providing an easy-to-measure thermodynamic signature of two-step melting. I also show that these two melting scenarios can be generically connected via an intervening multicritical point and obtain numerical estimates of multicritical exponents.