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Zhang J, Levenson-Falk EM, Ramshaw BJ, et al. Anomalous thermal diffusivity in underdoped YBa. Proc Natl Acad Sci U S A. 2017;114(21):5378-5383doi: 10.1073/pnas.1703416114.
Zhang, J., Levenson-Falk, E. M., Ramshaw, B. J., Bonn, D. A., Liang, R., Hardy, W. N., Hartnoll, S. A., & Kapitulnik, A. (2017). Anomalous thermal diffusivity in underdoped YBa. Proceedings of the National Academy of Sciences of the United States of America, 114(21), 5378-5383. https://doi.org/10.1073/pnas.1703416114
Zhang, Jiecheng, et al. "Anomalous thermal diffusivity in underdoped YBa." Proceedings of the National Academy of Sciences of the United States of America vol. 114,21 (2017): 5378-5383. doi: https://doi.org/10.1073/pnas.1703416114
Zhang J, Levenson-Falk EM, Ramshaw BJ, Bonn DA, Liang R, Hardy WN, Hartnoll SA, Kapitulnik A. Anomalous thermal diffusivity in underdoped YBa. Proc Natl Acad Sci U S A. 2017 May 23;114(21):5378-5383. doi: 10.1073/pnas.1703416114. Epub 2017 May 08. PMID: 28484003; PMCID: PMC5448191.
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Proc Natl Acad Sci U S A. 2017 May 23;114(21):5378-5383. doi: 10.1073/pnas.1703416114. Epub 2017 May 08.

Anomalous thermal diffusivity in underdoped YBa.

Proceedings of the National Academy of Sciences of the United States of America

Jiecheng Zhang, Eli M Levenson-Falk, B J Ramshaw, D A Bonn, Ruixing Liang, W N Hardy, Sean A Hartnoll, Aharon Kapitulnik

Affiliations

  1. Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305.
  2. Department of Physics, Stanford University, Stanford, CA 94305.
  3. Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853.
  4. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1.
  5. Canadian Institute for Advanced Research, Toronto, ON, Canada M5G 1Z8.
  6. Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305; [email protected].
  7. Department of Applied Physics, Stanford University, Stanford, CA 94305.

PMID: 28484003 PMCID: PMC5448191 DOI: 10.1073/pnas.1703416114

Abstract

The thermal diffusivity in the [Formula: see text] plane of underdoped YBCO crystals is measured by means of a local optical technique in the temperature range of 25-300 K. The phase delay between a point heat source and a set of detection points around it allows for high-resolution measurement of the thermal diffusivity and its in-plane anisotropy. Although the magnitude of the diffusivity may suggest that it originates from phonons, its anisotropy is comparable with reported values of the electrical resistivity anisotropy. Furthermore, the anisotropy drops sharply below the charge order transition, again similar to the electrical resistivity anisotropy. Both of these observations suggest that the thermal diffusivity has pronounced electronic as well as phononic character. At the same time, the small electrical and thermal conductivities at high temperatures imply that neither well-defined electron nor phonon quasiparticles are present in this material. We interpret our results through a strongly interacting incoherent electron-phonon "soup" picture characterized by a diffusion constant [Formula: see text], where [Formula: see text] is the soup velocity, and scattering of both electrons and phonons saturates a quantum thermal relaxation time [Formula: see text].

Keywords: bad metals; electron–phonon; thermal diffusivity

Conflict of interest statement

The authors declare no conflict of interest.

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