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

Abstract

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.

Authors:
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
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1605024
Grant/Contract Number:  
AC02-76SF00515; DMR-1708334
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, Jiecheng, Kountz, Erik D., Levenson-Falk, Eli M., Song, Dongjoon, Greene, Richard L., and Kapitulnik, Aharon. Thermal diffusivity above the Mott-Ioffe-Regel limit. United States: N. p., 2019. Web. doi:10.1103/physrevb.100.241114.
Zhang, Jiecheng, Kountz, Erik D., Levenson-Falk, Eli M., Song, Dongjoon, Greene, Richard L., & Kapitulnik, Aharon. Thermal diffusivity above the Mott-Ioffe-Regel limit. United States. doi:https://doi.org/10.1103/physrevb.100.241114
Zhang, Jiecheng, Kountz, Erik D., Levenson-Falk, Eli M., Song, Dongjoon, Greene, Richard L., and Kapitulnik, Aharon. Tue . "Thermal diffusivity above the Mott-Ioffe-Regel limit". United States. doi:https://doi.org/10.1103/physrevb.100.241114. https://www.osti.gov/servlets/purl/1605024.
@article{osti_1605024,
title = {Thermal diffusivity above the Mott-Ioffe-Regel limit},
author = {Zhang, Jiecheng and Kountz, Erik D. and Levenson-Falk, Eli M. and Song, Dongjoon and Greene, Richard L. and Kapitulnik, Aharon},
abstractNote = {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.},
doi = {10.1103/physrevb.100.241114},
journal = {Physical Review B},
number = 24,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

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