Thermal Hall Effect of Spin Excitations in a Kagome Magnet
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PhysRevLett.115.106603.pdf
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978.59 KB
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Author(s)
Hirschberger, Max
Chisnell, Robin
Lee, Young S.
Ong, N. P.
Date Issued
September 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Hirschberger, Max, Robin Chisnell, Young S. Lee, and N. P. Ong. “Thermal Hall Effect of Spin Excitations in a Kagome Magnet.” Physical Review Letters 115, no. 10 (September 2015). © 2015 American Physical Society
Version
Final published version
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 κ[subscript xy]. Here we report observation of a large κ[subscript xy] in the kagome magnet Cu(1-3, bdc) which orders magnetically at 1.8 K. The observed κ[subscript 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 κ[subscript xy] and κ[subscript xx] firmly precludes a phonon origin for the thermal Hall effect.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.115.106603
