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Thermal Hall effect in a phonon-glass Ba$$_3$$CuSb$$_2$$O$$_9$$

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Abstract

A distinct thermal Hall signal is observed in a quantum spin liquid candidate Ba$$_3$$CuSb$$_2$$O$$_9$$. The transverse thermal conduction shows a power-law temperature dependence below 40 K where a spin gap opens. We suggest that, through the very low longitudinal thermal conductivity and the thermal Hall signals, a phonon Hall effect is induced by strong phonon scatterings by orphan Cu$$^{2+}$$ spins formed in random domains of Cu$$^{2+}$$-Sb$$^{5+}$$ dumbbells.

Author and article information

Journal
1608.07401