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Anomalous thermal diffusivity in underdoped YBa2Cu3O6+x.

Jiecheng Zhang1,2, Eli M Levenson-Falk1,2, B J Ramshaw3

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Proceedings of the National Academy of Sciences of the United States of America
|May 10, 2017
PubMed
Summary

Thermal diffusivity in underdoped YBCO crystals reveals a strong electronic influence, particularly below the charge order transition. This suggests a complex interplay between electrons and phonons, challenging simple quasiparticle models.

Keywords:
bad metalselectron–phononthermal diffusivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Underdoped Yttrium Barium Copper Oxide (YBCO) crystals exhibit complex electronic properties.
  • Understanding thermal transport mechanisms is crucial for characterizing these high-temperature superconductors.

Purpose of the Study:

  • To measure the in-plane thermal diffusivity of underdoped YBCO crystals.
  • To investigate the temperature dependence and anisotropy of thermal diffusivity.
  • To elucidate the contributions of electronic and phononic components to thermal transport.

Main Methods:

  • Utilized a local optical technique to measure thermal diffusivity.
  • Employed a phase delay method between a point heat source and surrounding detectors for high-resolution measurements.
  • Analyzed thermal diffusivity anisotropy in the temperature range of 25-300 K.

Main Results:

  • Observed that thermal diffusivity anisotropy is comparable to electrical resistivity anisotropy.
  • Found a sharp drop in anisotropy below the charge order transition, mirroring electrical resistivity behavior.
  • High-temperature measurements indicate small electrical and thermal conductivities, suggesting incoherent quasiparticles.

Conclusions:

  • Thermal diffusivity in underdoped YBCO possesses significant electronic and phononic character.
  • The findings support a model of strongly interacting, incoherent electron-phonon systems.
  • A diffusion constant related to an electron-phonon 'soup' and saturated relaxation times explains the observed transport properties.