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Thermal Hall Effect of Spin Excitations in a Kagome Magnet

Author(s): Hirschberger, Max; Chisnell, Robin; Lee, Young S; Ong, Nai Phuan

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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.
Publication Date: 4-Sep-2015
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
DOI: doi:10.1103/PhysRevLett.115.106603
ISSN: 0031-9007
EISSN: 1079-7114
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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