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

研究成果: Article査読

79 被引用数 (Scopus)

抄録

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)].

本文言語English
論文番号140509
ページ(範囲)1405091-1405094
ページ数4
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
65
14
出版ステータスPublished - 2002 4月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

フィンガープリント

「High-resolution ac-calorimetry studies of the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル