Planar thermal Hall effect from phonons in cuprates

Abstract

A surprising "planar" thermal Hall effect, whereby the field is parallel to the current, has recently been observed in a few magnetic insulators, and this has been attributed to exotic excitations such as Majorana fermions or chiral magnons. Here we investigate the possibility of a planar thermal Hall effect in three different cuprate materials, in which the conventional thermal Hall conductivity ${\kappa }_{\mathrm{xy}}$ (with an out-of-plane field perpendicular to the current) is dominated by either electrons or phonons. Our measurements show that the planar ${\kappa }_{\mathrm{xy}}$ from electrons in cuprates is zero, as expected from the absence of a Lorentz force in the planar configuration. By contrast, we observe a sizable planar ${\kappa }_{\mathrm{xy}}$ in those samples where the thermal Hall response is due to phonons, even though it should in principle be forbidden by the high crystal symmetry. Our findings call for a careful re-examination of the mechanisms responsible for the phonon thermal Hall effect in insulators.

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Cited by in corpus (6)

• Thermal Hall response of an abelian chiral spin liquid at finite temperatures
• Spin-stripe order tied to the pseudogap phase in La1.8-xEu0.2SrxCuO4
• Thermal Hall conductivity of semimetallic graphite dominated by ambipolar phonon drag
• Phonon Thermal Hall Effect: The Roles of Disorder, Annealing, and Metallic Contacts
• Classification of magnon thermal Hall systems based on U(1) to non-Abelian gauge fields
• Anomalies in the thermal conductivity of honeycomb antiferromagnet MnPS${}_3$