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Title: Thermal diffusivity above the Mott-Ioffe-Regel limit

Journal Article · · Physical Review. B
ORCiD logo [1];  [1];  [2];  [3];  [4];  [1]
  1. Stanford Univ., CA (United States). Dept. of Physics; Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
  2. Univ. of Southern California, Los Angeles, CA (United States)
  3. Inst. for Basic Science (IBS), Seoul (Korea). Center for Correlated Electron Systems
  4. Univ. of Maryland, College Park, MD (United States). Dept. of Physics and Center for Nanophysics & Advanced Materials
+ Show Author Affiliations

We present high-resolution thermal diffusivity measurements on several near optimally doped electron- and hole-doped cuprate systems in a temperature range that passes through the Mott-Ioffe-Regel limit, above which the quasiparticle picture fails. Our primary observations are that the inverse thermal diffusivity is linear in temperature and can be fitted to $$D^{-1}_Q = aT + b$$. The slope a is interpreted through the Planckian relaxation time $$τ ≈ ℏ/k_BT$$ and a thermal diffusion velocity v B, which is close, but larger than the sound velocity. The intercept b represents a crossover diffusion constant that separates coherent from incoherent quasiparticles. These observations suggest that both phonons and electrons participate in the thermal transport, while reaching the Planckian limit for relaxation time.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1605024
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 24 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Thermalization and Possible Signatures of Quantum Chaos in Complex Crystalline Materials text January 2020

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