Magnetic and Critical Properties of Alternating Spin Chain with S=1/2, 1 in Magnetic Fields.
Magnetic and Critical Properties of Alternating Spin Chain with S=1/2, 1 in Magnetic Fields.
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DOI：
10.1143/jpsj.65.2381
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发表时间：
1996-08
影响因子：
1.7
通讯作者：
M. Fujii;S. Fujimoto;Norio Kawakami Department of Applied Physics;Osaka University Department of Physics;K. University
中科院分区：
文献类型：
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作者：
M. Fujii;S. Fujimoto;Norio Kawakami Department of Applied Physics;Osaka University Department of Physics;K. University
利用Bethe ansatz精确解研究了外磁场中具有S =1/2, 1交替自旋阵列的可积自旋链。计算的磁化曲线在临界磁场H = H C处有一个尖峰，比热在此处表现出发散性。我们还计算了有限尺寸的能谱修正，并利用共形场理论（CFT）获得了相关函数的临界指数。模型的低能性质由两个c =1 U (1) CFTs在H H c下描述。
We study an integrable spin chain with an alternating array of spins S =1/2, 1 in external magnetic fields using the Bethe ansatz exact solution. The calculated magnetization curve has a cusp at a critical magnetic field H = H C , at which the specific heat shows a divergence property. We also calculate finite-size corrections to the energy spectrum, and obtain the critical exponents of correlation functions using conformal field theory (CFT). Low-energy properties of the model are described by two c =1 U (1) CFTs at H H C .