Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal
In-plane surface Ka-band microwave impedance of optimally doped single 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 superco...
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| Veröffentlicht in: | Low temperature physics (Woodbury, N.Y.) N.Y.), 2011-08, Vol.37 (8), p.725-728 |
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| container_title | Low temperature physics (Woodbury, N.Y.) |
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| creator | 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, K. I. |
| description | In-plane surface Ka-band microwave impedance of optimally doped single 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. |
| doi_str_mv | 10.1063/1.3660321 |
| format | Article |
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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
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= 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
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= 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
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| title | Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal |
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