Electronic transport in unconventional superconductors

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The author investigates the electron transport coefficients in unconventional superconductors at low temperatures, where charge and heat transport are dominated by electron scattering from random lattice defects. He discusses the features of the pairing symmetry, Fermi surface, and excitation spectrum which are reflected in the low temperature heat transport. For temperatures {kappa}{sub B}T {approx_lt} {gamma} {much_lt} {Delta}{sub 0}, where {gamma} is the bandwidth of impurity induced Andreev states, certain eigenvalues become universal, i.e., independent of the impurity concentration and phase shift. Deep in the superconducting phase ({kappa}{sub B}T {approx_lt} {gamma}) the Wiedemann-Franz law, with Sommerfeld`s value of the Lorenz number, ... continued below

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23 p.

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Graf, M.J. December 31, 1998.

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Description

The author investigates the electron transport coefficients in unconventional superconductors at low temperatures, where charge and heat transport are dominated by electron scattering from random lattice defects. He discusses the features of the pairing symmetry, Fermi surface, and excitation spectrum which are reflected in the low temperature heat transport. For temperatures {kappa}{sub B}T {approx_lt} {gamma} {much_lt} {Delta}{sub 0}, where {gamma} is the bandwidth of impurity induced Andreev states, certain eigenvalues become universal, i.e., independent of the impurity concentration and phase shift. Deep in the superconducting phase ({kappa}{sub B}T {approx_lt} {gamma}) the Wiedemann-Franz law, with Sommerfeld`s value of the Lorenz number, is recovered. He compares the results for theoretical models of unconventional superconductivity in high-{Tc} and heavy fermion superconductors with experiment. The findings show that impurities are a sensitive probe of the low-energy excitation spectrum, and that the zero-temperature limit of the transport coefficients provides an important test of the order parameter symmetry.

Physical Description

23 p.

Notes

INIS; OSTI as DE99002560

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  • 1. international quasiclassical methods in superconducting, Verditz (Austria), 1998

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  • Other: DE99002560
  • Report No.: LA-UR--98-4082
  • Report No.: CONF-980011--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 350907
  • Archival Resource Key: ark:/67531/metadc685928

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 3, 2016, 1:32 p.m.

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Graf, M.J. Electronic transport in unconventional superconductors, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc685928/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.