London penetration depth in (BEDT-TTF)2 superconductors

R. W. Giannetta, D. D. Lawrie, A. Carrington, R. Prozorov, U. A. Schlueter, A. M. Kini, U. Geiser, J. Mohtasham, R. W. Winter, G. L. Gard

Research output: Contribution to journalConference articlepeer-review


Measurements of the London penetration depth, λ(T), are reported for crystals of superconducting κ-(ET)2 Cu[N(CN)2]Br (TC = 11.6 K) and β″-(ET)2-SF 5CH2CF2SO3 (TC = 5.2 K) at temperatures down to 0.35 K. For κ-(ET)2 Cu[N(CN) 2]Br the superfluid density shows the power law behavior characteristic of nodal quasiparticles with impurity scattering. The rate of change of superfluid density with temperature is higher than predicted by a weak-coupling d-wave model and higher than observed in the copper oxides. The in-plane penetration depth consistently shows a T3/2 dependence while the interplane penetration depth varies as T1.22. Measurements in β″-(ET)2-SF5CH2CF2SO 3 also show power law behavior consistent with nodal quasiparticles but with greater impurity scattering than in κ-(ET)2 Cu[N(CN)2]Br.

Original languageEnglish (US)
Pages (from-to)211-215
Number of pages5
JournalJournal De Physique. IV : JP
StatePublished - 2004
EventISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France
Duration: Sep 21 2003Sep 26 2003


  • Order parameter
  • Organic superconductor
  • Penetration depth
  • Superfluid density

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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