Phonon thermal Hall effect in a metallic spin ice

Taiki Uehara, Takumi Ohtsuki, Masafumi Udagawa, Satoru Nakatsuji and Yo Machida ()
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Taiki Uehara: Gakushuin University
Takumi Ohtsuki: The University of Tokyo
Masafumi Udagawa: Gakushuin University
Satoru Nakatsuji: The University of Tokyo
Yo Machida: Gakushuin University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract It has become common knowledge that phonons can generate thermal Hall effect in a wide variety of materials, although the underlying mechanism is still controversial. We study longitudinal κxx and transverse κxy thermal conductivity in Pr2Ir2O7, which is a metallic analog of spin ice. Despite the presence of mobile charge carriers, we find that both κxx and κxy are dominated by phonons. A T/H scaling of κxx unambiguously reveals that longitudinal heat current is substantially impeded by resonant scattering of phonons on paramagnetic spins. Upon cooling, the resonant scattering is strongly affected by a development of spin ice correlation and κxx deviates from the scaling in an anisotropic way with respect to field directions. Strikingly, a set of the κxx and κxy data clearly shows that κxy correlates with κxx in its response to magnetic field including a success of the T/H scaling and its failure at low temperature. This remarkable correlation provides solid evidence that an indispensable role is played by spin-phonon scattering not only for hindering the longitudinal heat conduction, but also for generating the transverse response.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32375-0

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DOI: 10.1038/s41467-022-32375-0

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