| Autor: |
Chen, Lu, Roux, Léna Le, Grissonnanche, Gaël, Boulanger, Marie-Eve, Thériault, Steven, Liang, Ruixing, Bonn, D. A., Hardy, W. N., Pyon, S., Takayama, T., Takagi, H., Xu, Kejun, Shen, Zhi-Xun, Taillefer, Louis |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Phys. Rev. X 14, 041011 (2024) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevX.14.041011 |
| Popis: |
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 $\kappa_{\rm {xy}}$ (with an out-of-plane field perpendicular to the current) is dominated by either electrons or phonons. Our measurements show that the planar $\kappa_{\rm {xy}}$ 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 $\kappa_{\rm {xy}}$ 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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