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Unusual temperature dependence of the London penetration depth in all-organic β``-(ET)2SF5CH2CF2SO3 single crystals

R. Prozorov, R. W. Giannetta, J. Schlueter, A. M. Kini, J. Mohtasham, R. W. Winter, G. L. Gard

cond-mat.supr-conarXiv:cond-mat/0009118

Abstract

The temperature dependence of the in-plane, λ, and interplane, λ, London penetration depth was measured in the metal-free all-organic superconductor β-ET (see title) (Tc ≈ 5.2 K). λ ~T3 up to 0.5 Tc, a power law previously observed only in materials thought to be p-wave superconductors. λ is larger than the sample dimensions down to the lowest temperatures (0.35 K), implying an anisotropy of λ/λ ~ 400-800.

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