Superconductivity And Other Properties

Journal of Low Temperature Physics

, Volume 142, Issue 3, pp 257-260

First online:

New results for superconductivity inκ-(BEDT-TTF)2Cu(NCS)2 when an applied magnetic field is aligned parallel to the conducting planes

  • C. MartinAffiliated withDepartment of Physics, Clark University
  • , K. ChoAffiliated withDepartment of Physics, Clark University
  • , I. MihutAffiliated withDepartment of Physics, Clark University
  • , T. CoffeyAffiliated withDepartment of Physics, Clark University
  • , C. C. AgostaAffiliated withDepartment of Physics, Clark University
  • , S. W. TozerAffiliated withDepartment of Physics, Clark University
  • , H. A. RadovanAffiliated withDepartment of Physics, Clark University
  • , E. C. PalmAffiliated withDepartment of Physics, Clark University
  • , T. P. MurphyAffiliated withDepartment of Physics, Clark University
    • , J. A. SchlueterAffiliated withDepartment of Physics, Clark University

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Abstract

Using a Tunnel Diode Oscillator technique, we have measured the effect of a parallel magnetic field on the in-plane rf penetration depths in organic [α-(BEDT-TTF)2NH4Hg(SCN)4 and k-(BEDT-TTF)2Cu(NCS)2] and heavy fermion (CeCoIn5) superconductors. We show that in this particular geometry, the effects due to vortex activity are minimized. The penetration depth is then governed by the density of superconducting carriers. It is shown in many experiments including rf penetration depth measurement that α-(BEDT-TTF)2NH4Hg(SCN)4 and CeCoIn5 have s-wave and d-wave pairing symmetries, respectively. The pairing symmetry of k-(BEDT-TTF)2-Cu(NCS)2, however, is still an unsolved matter, showing inconsistent results. In this paper, the penetration depth of k-(BEDT-TTF)2Cu(NCS)2 is shown to be more similar to α-(BEDT-TTF)2NH4Hg(SCN)4 than to CeCoIn5, suggesting the pairing is nodeless.

PACS numbers

74.70Kn 74.25.Dw 74.20.Rp 74.25.Nf