Specific Heat of the Spin-1/2 Dimerized Antiferromagnetic Chains at Low Temperatures

被引：0
作者：
Katkov V.L. [1 ]
机构：
[1] Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow oblast
来源：
Physics of Particles and Nuclei Letters | 2018年 / 15卷 / 6期
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D O I：
10.1134/S1547477118060109
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学科分类号：
摘要：
A spin linear chain with antiferromagnetic nearest-neighbor interaction is considered. The coupling constants of each spin with the right and left neighbors are different. Within the Bulaevskii model, the magnetic specific heat is calculated as a function of temperature for different alternation parameters. It is shown that the temperature dependence of the specific heat has two regimes. In the first one, the temperature is lower than half the band gap; in this case, in the low-temperature limit, C ∝ T-1 exp(−Δ/kBT). In the second regime, the temperature exceeds half the band gap; in this case, we approximately have C ∝ T. © 2018, Pleiades Publishing, Ltd.
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页码：668 / 672
页数：4
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