Phonon Thermal Hall Effect in Strontium Titanate - Kölner UniversitätsPublikationsServer

Li, Xiaokang ORCID: 0000-0001-8828-5044, Fauque, Benoit, Zhu, Zengwei and Behnia, Kamran ORCID: 0000-0001-8997-5645 (2020). Phonon Thermal Hall Effect in Strontium Titanate. Phys. Rev. Lett., 124 (10). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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DOI:10.1103/PhysRevLett.124.105901

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, kappa(xy), in a variety of contexts, however, have assumed a negligibly small phonon contribution. We present a study of kappa(xy) in quantum paraelectric SrTiO3, 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, kappa(xy) (T) and kappa(T) peak at the same temperature and the former decreases faster than the latter at both sides of the peak. Interestingly, in the case of La2CuO4 and alpha-RuCl3, kappa(xy) (T) and kappa(T) peak also at the same temperature. We also studied KTaO3 and found a small signal, indicating that a sizable kappa(xy)(T) is not a generic feature of quantum paraelectrics. Combined to other observations, this points to a crucial role played by antiferrodistortive domains in generating kappa(xy) of this solid.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Li, Xiaokang	UNSPECIFIED	orcid.org/0000-0001-8828-5044	UNSPECIFIED
Fauque, Benoit	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Zhu, Zengwei	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Behnia, Kamran	UNSPECIFIED	orcid.org/0000-0001-8997-5645	UNSPECIFIED