Large thermomagnetic effects in weakly disordered Heisenberg chains

Abstract

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 $B\sim T$. In sufficiently clean samples, the reduction of 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 $B\sim T$ observed in recent heat transport measurements on copper pyrazine dinitrate, but a fully quantitative description is not possible within our model.

5 pages, 2 figures

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Cited by in corpus (6)

• Heat transport in the $XXZ$ spin chain: from ballistic to diffusive regimes and dephasing enhancement
• Large violation of Wiedemann Franz law in Luttinger liquids
• Spinon localization in the heat transport of the spin-1/2 ladder compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$
• Dynamical reduction of the dimensionality of exchange interactions and the "spin-liquid" phase of $\kappa$-(BEDT-TTF)${}_{2}X$
• Exchange constants in molecule-based magnets derived from density functional methods
• Magnetothermal Transport in Spin-Ladder Systems