Abstract
It has been known for more than a decade that phonons can produce an off-diagonal thermal conductivity in the presence of a magnetic field. Recent studies of thermal Hall conductivity, , in a variety of contexts, however, have assumed a negligibly small phonon contribution. We present a study of in quantum paraelectric , which is a nonmagnetic insulator and find that its peak value exceeds what has been reported in any other insulator, including those in which the signal has been qualified as “giant.” Remarkably, and peak at the same temperature and the former decreases faster than the latter at both sides of the peak. Interestingly, in the case of and , and peak also at the same temperature. We also studied and found a small signal, indicating that a sizable is not a generic feature of quantum paraelectrics. Combined to other observations, this points to a crucial role played by antiferrodistortive domains in generating of this solid.
- Received 16 September 2019
- Accepted 20 February 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.105901
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