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

Müller, J., Lang, M., Helfrich, R., Steglich, F., & Sasaki, T. (2002). High-resolution ac-calorimetry studies of the quasi-two- dimensional organic superconductor kappa-(BEDT- TTF)2Cu(NCS)2. Physical Review B, 65(14): 140509, pp. 140509-140509. doi:10.1103/PhysRevB.65.140509.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-3161-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-02B1-A
Genre: Journal Article

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Müller, J.1, Author              
Lang, M.1, Author              
Helfrich, R.1, Author              
Steglich, F.2, Author              
Sasaki, T., Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: 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)].

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Language(s): eng - English
 Dates: 2002-04-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 17877
ISI: 000174980300024
DOI: 10.1103/PhysRevB.65.140509
 Degree: -

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Title: Physical Review B
  Alternative Title : Phys. Rev. B
Source Genre: Journal
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Pages: - Volume / Issue: 65 (14) Sequence Number: 140509 Start / End Page: 140509 - 140509 Identifier: ISSN: 0163-1829