Thermomagnetic power and figure of merit for spin-1/2 heisenberg chain

Transport properties in the presence of magnetic fields are numerically studied for the spin-1/2 Heisenberg XXZ chain. The breakdown of the spin-reversal symmetry due to the magnetic field induces the magnetothermal effect. In analogy with the thermoelectric effect in electron systems, the thermomag...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2005-12, Vol.74 (12), p.3241-3247
Main Authors: FURUKAWA, Shunsuke, IKEDA, Dai, SAKAI, Kazumitsu
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Electronic transport in condensed matter
Exact sciences and technology
General theory and models of magnetic ordering
Magnetic properties and materials
Physics
Thermoelectric and thermomagnetic effects
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Summary:Transport properties in the presence of magnetic fields are numerically studied for the spin-1/2 Heisenberg XXZ chain. The breakdown of the spin-reversal symmetry due to the magnetic field induces the magnetothermal effect. In analogy with the thermoelectric effect in electron systems, the thermomagnetic power (magnetic Seebeck coefficient) is provided, and is numerically evaluated by the exact diagonalization for wide ranges of temperatures and various magnetic fields. For the antiferromagnetic regime, we find the magnetic Seebeck coefficient changes sign at certain temperatures, which is interpreted as an effect of strong correlations. We also compute the thermomagnetic figure of merit determining the efficiency of the thermomagnetic devices for cooling or power generation.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.74.3241