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Title: A lower bound to the thermal diffusivity of insulators

Journal Article · · Journal of Physics. Condensed Matter
ORCiD logo [1];  [2]
  1. PSL Research Univ., Paris (France); Univ. zu Köln, Koln (Germany)
  2. Stanford Univ., Stanford, CA (United States)

It has been known for decades that thermal conductivity of insulating crystals becomes proportional to the inverse of temperature when the latter is comparable to, or higher than, the Debye temperature. This behavior has been understood as resulting from Umklapp scattering among phonons. We put under scrutiny the magnitude of the thermal diffusion constant in this regime and find that it does not fall below a threshold set by the square of sound velocity times the Planckian time (τp = h/kBT). The conclusion, based on scrutinizing the ratio in cubic crystals with high thermal resistivity, appears to hold even in glasses where Umklapp events are not conceivable. Furthermore, explaining this boundary, reminiscent of a recently-noticed limit for charge transport in metals, is a challenge to theory.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1576517
Journal Information:
Journal of Physics. Condensed Matter, Vol. 31, Issue 40; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (7)

Thermalization and possible signatures of quantum chaos in complex crystalline materials journal September 2019
Thermal Diffusivity Above Mott-Ioffe-Regel Limit text January 2018
Holographic axion model: A simple gravitational tool for quantum matter journal June 2021
On the Planckian bound for heat diffusion in insulators journal March 2020
Classical model for sub-Planckian thermal diffusivity in complex crystals journal May 2021
Thermalization and Possible Signatures of Quantum Chaos in Complex Crystalline Materials text January 2020
Phonons, electrons and thermal transport in Planckian high T$_c$ materials preprint January 2020

Figures / Tables (3)


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