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

Interplay between spin frustration and magnetism in the exactly solved two-leg mixed spin ladder

Yan Qi(齐岩), Song-Wei Lv(吕松玮), An Du(杜安), Nai-sen Yu(于乃森)   

  1. 1 School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, China;
    2 College of Sciences, Northeastern University, Shenyang 110819, China
  • 收稿日期:2016-05-21 修回日期:2016-07-28 出版日期:2016-11-05 发布日期:2016-11-05
  • 通讯作者: Yan Qi, Nai-sen Yu E-mail:qiyan@dlnu.edu.cn;naisenyu@163.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11547236), the General Project of the Education Department of Liaoning Province, China (Grant No. L2015130), the Fundamental Research Funds for the Central Universities, China (Grant Nos. DC201501065 and DCPY2016014), and the Doctoral Starting-up Foundation of Dalian Nationalities University, China.

Interplay between spin frustration and magnetism in the exactly solved two-leg mixed spin ladder

Yan Qi(齐岩)1, Song-Wei Lv(吕松玮)1, An Du(杜安)2, Nai-sen Yu(于乃森)1   

  1. 1 School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, China;
    2 College of Sciences, Northeastern University, Shenyang 110819, China
  • Received:2016-05-21 Revised:2016-07-28 Online:2016-11-05 Published:2016-11-05
  • Contact: Yan Qi, Nai-sen Yu E-mail:qiyan@dlnu.edu.cn;naisenyu@163.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11547236), the General Project of the Education Department of Liaoning Province, China (Grant No. L2015130), the Fundamental Research Funds for the Central Universities, China (Grant Nos. DC201501065 and DCPY2016014), and the Doctoral Starting-up Foundation of Dalian Nationalities University, China.

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.

关键词: mixed-spin ladder, transfer-matrix method, exact solution, frustration

Abstract:

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.

Key words: mixed-spin ladder, transfer-matrix method, exact solution, frustration

中图分类号:  (Spin chain models)

  • 75.10.Pq
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))