标题： 六方密堆积晶格：相变与自旋输运 显示英文标题

标题： Hexagonal-Close-Packed Lattice: Phase Transition and Spin Transport

摘要： 我们通过广泛的蒙特卡洛模拟研究了六方密堆积晶格中的基态（GS）和相变。 我们假设面内相互作用$J_1$和面间相互作用$J_2$，均为反铁磁的。 系统在$\eta=J_1/J_2$（$\eta_c$）的临界值以下和以上具有两种类型的GS构型。 对于伊辛模型，有一个$\eta_c=0.5$将面内铁磁和反铁磁状态分开，而对于XY模型，$\eta_c=1/3$将共线和非共线自旋构型分开。 相变被证明在$\eta> (<) \eta_c$时为一级（二级）相变。 计算了伊辛模型的自旋电阻率。 它在二级区域的磁转变处显示一个圆顶最大值，在一级区域的$\eta$中显示不连续性。 显示英文摘要

摘要： We study the ground state (GS) and the phase transition in a hexagonal-close-packed lattice with both XY and Ising models by using extensive Monte Carlo simulation. We suppose the in-plane interaction $J_1$ and inter-plane interaction $J_2$, both antiferromagnetic. The system is frustrated with two kinds of GS configuration below and above a critical value of $\eta=J_1/J_2$ ($\eta_c$). For the Ising case, one has $\eta_c=0.5$ which separates in-plane ferromagnetic and antiferromagnetic states, while for the XY case $\eta_c=1/3$ separates the collinear and non collinear spin configurations. The phase transition is shown to be of first (second) order for $\eta> (<) \eta_c$. The spin resistivity is calculated for the Ising case. It shows a rounded maximum at the magnetic transition in the second-order region, and a discontinuity in the first-order region of $\eta$.