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

Barannik, A. A.; Cherpak, N. T.; Ni, N.; Tanatar, M. A.; Vitusevich, S. A.; Skresanov, V. N.; Canfield, P. C.; Prozorov, R.; Glamazdin, V. V.; Torokhtii, Kostiantyn

doi:10.1063/1.3660321

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In-plane surface Ka-band microwave impedance of optimally dopedsingle crystals of the Fe-based superconductor Ba(Fe0.926Co0.074)2As2 (Tc = 22.8 K) 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 Δλ(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 λ(T) at low temperatures is well described by one superconducting small-gap (Δ≅0.75 in kTc units, where k is Boltzmann coefficient) exponential dependence.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/145071

Titolo:	Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal
Autori:	Barannik A. A. Cherpak N. T. Ni N. Tanatar M. A. Vitusevich S. A. Skresanov V. N. Canfield P. C. Prozorov R. Glamazdin V. V. TOROKHTII, KOSTIANTYN mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2011
Rivista:	LOW TEMPERATURE PHYSICS
Abstract:	In-plane surface Ka-band microwave impedance of optimally dopedsingle crystals of the Fe-based superconductor Ba(Fe0.926Co0.074)2As2 (Tc = 22.8 K) 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 Δλ(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 λ(T) at low temperatures is well described by one superconducting small-gap (Δ≅0.75 in kTc units, where k is Boltzmann coefficient) exponential dependence.
Handle:	http://hdl.handle.net/11590/145071
Appare nelle tipologie:	1.1 Articolo in rivista

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