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Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal

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arxiv 1106.6266 v1 pith:GMB4Q6GJ submitted 2011-06-30 cond-mat.supr-con physics.ins-det

Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal

A.A. Barannik , N.T. Cherpak , N. Ni , M.A. Tanatar , S.A. Vitusevich , V.N. Skresanov , P.C. Canfield , R. Prozorov
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V.V. Glamazdin K.I. Torokhtii
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classification cond-mat.supr-con physics.ins-det
keywords dependencedeltadepthlambdalondonpenetrationsingletemperature
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In-plane surface Ka-band microwave impedance of optimally doped single crystals of the Fe-based superconductor Ba(Fe0.926Co0.074)2As2 (Tc= 22.8K) was measured. Sensitive sapphire disk quasi-optical resonator with high-Tc cuprate conducting endplates was developed specially for Fe-pnictide superconductors. It allowed finding temperature variation of London penetration depth in a form of power law, namely \Delta \lambda (T)~ Tn with n = 2.8 from low temperatures up to at least 0.6Tc consisted with radio-frequency measurements. This exponent points towards nodeless state with pairbreaking scattering, which can support one of the extended s-pairing symmetries. The dependence \lambda(T) at low temperatures is well described by one superconducting small-gap (\Delta \cong 0.75 in kTc units, where k is Boltzman coefficient) exponential dependence.

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