Thermal diffusivity above the Mott-Ioffe-Regel limit

Zhang, Jiecheng; Kountz, Erik D.; Levenson-Falk, Eli M.; Song, Dongjoon; Greene, Richard L.; Kapitulnik, Aharon

doi:10.1103/physrevb.100.241114

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

Journal Article · 24 December 2019 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.100.241114 · OSTI ID:1605024

^[1]; Kountz, Erik D. ^[1]; Levenson-Falk, Eli M. ^[2]; Song, Dongjoon ^[3]; Greene, Richard L. ^[4]; Kapitulnik, Aharon ^[1]

Stanford Univ., CA (United States). Dept. of Physics; Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
Univ. of Southern California, Los Angeles, CA (United States)
Inst. for Basic Science (IBS), Seoul (Korea). Center for Correlated Electron Systems
Univ. of Maryland, College Park, MD (United States). Dept. of Physics and Center for Nanophysics & Advanced Materials

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; DMR-1708334

OSTI ID:: 1605024

Journal Information:: Physical Review. B, Vol. 100, Issue 24; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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