The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents

被引：0
|
作者：
A. Klümper
机构：
[1] Universität zu Köln,
[2] Institut für Theoretische Physik,undefined
[3] Zülpicher Strasse 77,undefined
[4] 50937,undefined
[5] Germany,undefined
来源：
The European Physical Journal B - Condensed Matter and Complex Systems | 1998年 / 5卷
关键词：
PACS. 75.10.Jm Quantized spin models- 75.40.-s Critical-point effects, specific heats, short-range order- 72.15.Nj Collective modes (e.g., in one-dimensional conductors);
D O I：
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学科分类号：
摘要：
We present numerical and analytical results for the thermodynamical properties of the spin-1/2 Heisenberg chain at arbitrary external magnetic field. Special emphasis is placed on logarithmic corrections in the susceptibility and specific heat at very low temperatures (T/J=10-24) and small fields. A longstanding controversy about the specific heat is resolved. At zero temperature the spin-Peierls exponent is calculated in dependence on the external magnetic field. This describes the energy response of the system to commensurate and incommensurate modulations of the lattice. The exponent for the spin gap in the incommensurate phase is given.
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页码：677 / 685
页数：8
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