Journal
PHYSICAL REVIEW B
Volume 79, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.064406
Keywords
exchange interactions (electron); Heisenberg model; magnetisation; thermal conductivity; thermomagnetic effects; umklapp process
Funding
- German-Israeli Foundation
- DFG [SFB 608]
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The interplay of different scattering mechanisms can lead to novel effects in transport. We show theoretically that the interplay of weak impurity and umklapp scattering in spin-1/2 chains leads to a pronounced dip in the magnetic field dependence of the thermal conductivity kappa at a magnetic field B similar to T. In sufficiently clean samples the reduction in the magnetic contribution to heat transport can easily become larger than 50%, and the effect is predicted to exist even in samples with a large exchange coupling, J > B, where the field-induced magnetization is small. Qualitatively, our theory might explain dips at B similar to T observed in recent heat transport measurements on copper pyrazine dinitrate, but a fully quantitative description is not possible within our model.
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