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|Abstract:||At low temperatures, the thermal conductivity of spin excitations in a magnetic insulator can exceed that of phonons. However, because they are charge neutral, the spin waves are not expected to display a thermal Hall effect. However, in the kagome lattice, theory predicts that the Berry curvature leads to a thermal Hall conductivity kappa(xy). Here we report observation of a large.xy in the kagome magnet Cu(1-3, bdc) which orders magnetically at 1.8 K. The observed kappa(xy) undergoes a remarkable sign reversal with changes in temperature or magnetic field, associated with sign alternation of the Chern flux between magnon bands. The close correlation between kappa(xy) and.xx firmly precludes a phonon origin for the thermal Hall effect.|
|Electronic Publication Date:||3-Sep-2015|
|Citation:||Hirschberger, Max, Chisnell, Robin, Lee, Young S, Ong, NP. (2015). Thermal Hall Effect of Spin Excitations in a Kagome Magnet. PHYSICAL REVIEW LETTERS, 115 (10.1103/PhysRevLett.115.106603|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||PHYSICAL REVIEW LETTERS|
|Version:||Final published version. This is an open access article.|
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