Phase diagram of dipolar-coupled XY moments on disordered square lattices
Phase diagram of dipolar-coupled XY moments on disordered square lattices
复制标题
无序方晶格上偶极耦合 XY 矩的相图
作者：
Dominik Schildknecht;L. Heyderman;P. Derlet
分析了平面内偶极耦合磁矩的稀释无序和随机位移无序的影响。为了区分不同的相，推导了新的序参量，并对截断的偶极哈密顿量进行了平行回火蒙特卡罗模拟，得到了两种失序的相图。我们发现稀释无序和随机位移无序都给出了相似的相图，即在足够小的温度下无序有利于所谓的微涡相。这可以用偶极耦合系统中存在的通量闭合来理解。
The effects of dilution disorder and random-displacement disorder are analyzed for dipolar-coupled magnetic moments confined in a plane, which were originally placed on the square lattice. In order to distinguish the different phases, new order parameters are derived and parallel tempering Monte Carlo simulations are performed for a truncated dipolar Hamiltonian to obtain the phase diagrams for both types of disorder. We find that both dilution disorder and random-displacement disorder give similar phase diagrams, namely, disorder at small enough temperatures favors a so-called microvortex phase. This can be understood in terms of the flux closure present in dipolar-coupled systems.
影响因子：
4
作者：
Velten, Sven;Streubel, Robert;Fischer, Peter
通讯作者：
Fischer, Peter