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|a Hirschberger, Max
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|a Massachusetts Institute of Technology. Department of Physics
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|a Chisnell, Robin
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|a Lee, Young S.
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|a Chisnell, Robin
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|a Lee, Young S.
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|a Ong, N. P.
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|a Thermal Hall Effect of Spin Excitations in a Kagome Magnet
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|b American Physical Society,
|c 2015-09-08T12:54:14Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/98381
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|a 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.
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|a National Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Grant DMR 1420541)
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|a Article
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|t Physical Review Letters
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