Large thermal Hall conductivity of neutral spin excitations in a frustrated quantum magnet

Max Hirschberger, Jason W. Krizan, R. J. Cava, N. P. Ong

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

In frustrated quantum magnets, long-range magnetic order fails to develop despite a large exchange coupling between the spins. In contrast to the magnons in conventional magnets, their spin excitations are poorly understood. Here, we show that the thermal Hall conductivity κxy provides a powerful probe of spin excitations in the "quantum spin ice" pyrochlore Tb2Ti2O7. The thermal Hall response is large, even though the material is transparent. The Hall response arises from spin excitations with specific characteristics that distinguish them from magnons. At low temperature (<1 kelvin), the thermal conductivity resembles that of a dirty metal. Using the Hall angle, we construct a phase diagram showing how the excitations are suppressed by a magnetic field.

Original languageEnglish (US)
Pages (from-to)106-109
Number of pages4
JournalScience
Volume348
Issue number6230
DOIs
StatePublished - Apr 3 2015

All Science Journal Classification (ASJC) codes

  • General

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