Specific Heat of the Spin-1/2 Antiferromagnetic Heisenberg Chain

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2001,（9）
• 所属期刊栏目: CONDENSED MATTER:ELECTRONIC STRUCTURE, ELECTRICAL,
• 页码范围: 1261-1263
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

A simple analytic theory of thermodynamics at finite temperature for the spin-1/2 antiferromagnetic Heisenberg chain is proposed based on the picture of the particle-hole pair excitations. The dispersion relation of the particle-hole pairs is derived in the formulation of thermodynamic Bethe ansatz provided that the particles and holes have the same energy and they are excited as normalmodes. It is shown that the behaviour of the specific heat is in excellent agreement with the numerical and experimental results.