High-resolution ac-calorimetry studies of the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

J. Müller, M. Lang, R. Helfrich, F. Steglich, T. Sasaki

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Abstract

We report high-resolution specific-heat measurements on the quasi-two-dimensi-onal organic superconductorκ(BEDTTTF)2Cu(NCS)2, performed by using a sensitive ac-modulation technique. The main observations are (i) a discontinuity at Tc much in excess of what is expected for a weak-coupling BCS superconductor and (ii) a quasiparticle contribution to the specific heat with an exponentially weak temperature dependence at T ≪Tc. The latter finding is incompatible with an order parameter that vanishes at certain parts of the Fermi surface. The data for T≥Tc can be well described by a strong-coupling extension of the BCS theorythe α-modelsimilar to what has been recently found for the κ-(BEDT-TTF)2Cu[N(CN)2]Br salt [Elsinger et al., Phys. Rev. Lett. 84, 6098 (2000)].

Original languageEnglish
Article number140509
Pages (from-to)1405091-1405094
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number14
Publication statusPublished - 2002 Apr 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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