Interplane penetration depth and coherent transport in organic superconductors

Abstract

Measurements of the interlayer penetration depth λ⊥ have been performed on single crystals of the organic superconductors κ−(ET)2Cu[N(CN)2]Br and κ−(ET)2Cu(NCS)2. We find that λ⊥(0)≈130 μm for both materials. The normalized superfluid density ρ⊥=[λ⊥(0)/λ⊥(T)]2 may be fit equally well to a power law 1−ρ⊥∼Tn with n=1.3–1.5 or to the form 1−ρ⊥=α(T2/TC)/(T+T∗), consistent with a d-wave pairing state with impurity scattering. The data imply coherent transport between conducting planes, in agreement with recent magnetoresistive measurements [J. Singleton, P. A. Goddard, A. Ardavan, N. Harrison, S. J. Blundell, J. A. Schlueter, and A. M. Kini, Phys. Rev. Lett. 88, 037001 (2002)] and in contrast to the copper oxides.

Source-reported materials — not catalogue approval

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