Evidence for Strong Electron-Phonon Coupling in Thermal Conductivity of YBaSub2CuSub3OSub7-delta

Abstract

We have measured the ab plane thermal conductivity (k) on single crystal YBa2Cu3O(7-delta) (delta = approx. 0.08) in the temperature range 10K < or = T < or = 300K. Our main focus is an analysis of the slope change in k (T) which occurs just below the superconducting transition. The reduced temperature (t=T/Tc) derivative of the normalized thermal conductivity, as determined from the data, is rather small, < or = 1.1. From measurements of the electrical conductivity on the same specimens and application of the Wiedemann-Franz Law we determine the relative contributions to the heat conduction from the carriers and the lattice, and discuss the normal-state phonon scattering mechanisms. Employing these results we calculate the slope of the lattice thermal conductivity at Tc and infer that the slope of the carrier conductivity must be very large, > or = 6. This result implies strong coupling for some of the carriers.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1991
Accession Number
ADA243192

Entities

People

  • Joshua L. Cohn
  • Stuart A. Wolf
  • Terrell A. Vanderah

Organizations

  • Naval Air Weapons Station China Lake

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Conductivity
  • Couplings
  • Crystal Lattice Vibrations
  • Crystal Lattices
  • Crystals
  • Electrical Conductivity
  • High Temperature
  • Materials
  • Measurement
  • Military Research
  • Physical Properties
  • Scattering
  • Single Crystals
  • Superconductivity
  • Thermal Conductivity
  • Transition Temperature
  • Transitions

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Solar Photovoltaics and Thermoelectric Devices.
  • Superconducting Magnet Technology

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  • AI & ML
  • AI & ML - Bayesian Inference
  • Microelectronics
  • Microelectronics - Graphene