中国物理B ›› 2016, Vol. 25 ›› Issue (11): 117501-117501.doi: 10.1088/1674-1056/25/11/117501
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
Yan Qi(齐岩), Song-Wei Lv(吕松玮), An Du(杜安), Nai-sen Yu(于乃森)
Yan Qi(齐岩)1, Song-Wei Lv(吕松玮)1, An Du(杜安)2, Nai-sen Yu(于乃森)1
摘要:
We study a mixed spin-( 3/2, 1) ladder system with antiferromagnetic rung coupling and next-nearest-neighbor interaction. The exactly solved Ising-chain model is employed to investigate the ground-state properties and thermodynamics of the low-dimensional ladder system. Our results show that the competition between different exchange couplings brings in a large variety of ground states characterized by various values of normalized magnetization equal to 0, 1/5, 2/5, 3/5, 1. Moreover, an interesting double-peak structure is also detected in the thermal dependence of magnetic susceptibility and specific heat when the frustration comes into play. It is shown that the double-peak phenomenon at zero-field for the case of AF2 ground-state arises from the very strong antiferromagnetic rung coupling, while other cases are attributed to the excitations induced by temperature and external field around the phase boundary.
中图分类号: (Spin chain models)