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Related Experiment Videos

kappa-(BEDT-TTF)2Cu[N(CN)(2)]Br: a fully gapped strong-coupling superconductor.

H Elsinger1, J Wosnitza, S Wanka

  • 1Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany.

Physical Review Letters
|September 16, 2000
PubMed
Summary

High-resolution specific-heat measurements reveal that the organic superconductor kappa-(bis(ethylenedithio)tetrathiafulvalene)2-Cu[N(CN)2]Br exhibits a fully gapped order parameter, evidenced by the exponential vanishing of its electronic specific heat in the superconducting state.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Organic Electronics

Background:

  • Organic superconductors, such as kappa-(BEDT-TTF)2-Cu[N(CN)2]Br, are materials exhibiting superconductivity at low temperatures.
  • Understanding the electronic properties and superconducting mechanisms in these materials is crucial for advancing superconductor technology.

Purpose of the Study:

  • To investigate the specific heat of kappa-(BEDT-TTF)2-Cu[N(CN)2]Br.
  • To determine the nature of the superconducting state and the energy gap in this organic superconductor.

Main Methods:

  • High-resolution specific-heat measurements were performed.
  • Measurements were conducted in both the superconducting state (B = 0 Tesla) and the normal state (B = 14 Tesla).

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Main Results:

  • A distinct anomaly in specific heat was observed at the critical temperature (Tc) of 11.5 K.
  • The electronic specific heat contribution (Ces) was well-described by strong-coupling BCS theory.
  • Ces exhibited exponential vanishing in the superconducting state.

Conclusions:

  • The exponential vanishing of Ces provides strong evidence for a fully gapped superconducting order parameter.
  • The findings support the application of BCS theory to describe the electronic properties of this organic superconductor.