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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2002     Display Documents



ID: 17877.0, MPI für Chemische Physik fester Stoffe / publications 2002
High-resolution ac-calorimetry studies of the quasi-two- dimensional organic superconductor kappa-(BEDT- TTF)2Cu(NCS)2
Authors:Müller, J.; Lang, M.; Helfrich, R.; Steglich, F.; Sasaki, T.
Language:English
Date of Publication (YYYY-MM-DD):2002-04-01
Title of Journal:Physical Review B
Journal Abbrev.:Phys. Rev. B
Volume:65
Issue / Number:14
Start Page:140509
End Page:140509
Sequence Number of Article:140509
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We report high-resolution specific-heat measurements on the quasi-two-dimensional organic superconductor kappa-(BEDT- TTF)(2)Cu(NCS)(2), performed by using a sensitive ac-modulation technique. The main observations are (i) a discontinuity at T-c 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< T-c. The latter finding is incompatible with an order parameter that vanishes at certain parts of the Fermi surface. The data for Tless than or equal toT(c) can be well described by a strong-coupling extension of the BCS theory - the alpha- model - similar to what has been recently found for the kappa- (BEDT-TTF)(2)Cu[N(CN)(2)]Br salt [Elsinger , Phys. Rev. Lett. 84, 6098 (2000)].
Comment of the Author/Creator:Date: 2002, APR 1
External Publication Status:published
Document Type:Article
Communicated by:Ina Wanschura
Affiliations:MPI für chemische Physik fester Stoffe
External Affiliations:Max Planck Inst Chem Phys Fester Stoffe, Nothnitzer Str 40, D-; 01187 Dresden, Germany; Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany; Univ Frankfurt, Inst Phys, D-60054 Frankfurt, Germany; Tohoku Univ, Inst Mat Res, Sendai, Miyagi 98077, Japan
Identifiers:ISI:000174980300024 [ID No:1]
ISSN:0163-1829 [ID No:2]
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