Thermal Hall Effect of Spin Excitations in a Kagome Magnet

Max Hirschberger, Robin Chisnell, Young S. Lee, N. P. Ong

Research output: Contribution to journalArticle

100 Scopus citations

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 κxy. Here we report observation of a large κxy in the kagome magnet Cu(1-3, bdc) which orders magnetically at 1.8 K. The observed κxy 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 κxy and κxx firmly precludes a phonon origin for the thermal Hall effect.

Original languageEnglish (US)
Article number106603
JournalPhysical review letters
Volume115
Issue number10
DOIs
StatePublished - Sep 3 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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