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|March 29, 2020
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Phonons can generate significant off-diagonal thermal conductivity in insulators like SrTiO3, challenging previous assumptions. This study reveals a "giant" thermal Hall conductivity in SrTiO3, highlighting the role of antiferrodistortive domains.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • Phonons are known to induce off-diagonal thermal conductivity under magnetic fields.
  • Recent research often overlooks or assumes negligible phonon contributions to thermal Hall conductivity.
  • Understanding phonon-driven thermal transport is crucial for novel electronic and thermal devices.

Purpose of the Study:

  • To investigate the phonon contribution to thermal Hall conductivity (κxy) in quantum paraelectric SrTiO3.
  • To determine if SrTiO3 exhibits a significant thermal Hall conductivity signal.
  • To explore the relationship between thermal conductivity (κ) and thermal Hall conductivity (κxy) in insulating materials.

Main Methods:

  • Experimental measurement of thermal Hall conductivity (κxy) and thermal conductivity (κ) in SrTiO3 as a function of temperature.
  • Comparative analysis of κxy and κ(T) behavior.
  • Study of KTaO3 to assess the generality of the phenomenon in quantum paraelectrics.

Main Results:

  • SrTiO3 exhibits a peak thermal Hall conductivity exceeding that of any previously reported insulator.
  • Both κxy(T) and κ(T) in SrTiO3 peak at the same temperature and exhibit similar decay profiles.
  • A small κxy signal in KTaO3 suggests that sizable thermal Hall conductivity is not universal in quantum paraelectrics.

Conclusions:

  • Antiferrodistortive domains play a critical role in generating the observed off-diagonal thermal conductivity in SrTiO3.
  • The findings challenge the assumption of negligible phonon contributions in thermal Hall conductivity studies.
  • This work opens new avenues for exploring phonon-mediated thermal transport in materials.