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

Автор(и)

  • A.A. Barannik A. Usikov Institute of Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12 Acad. Proskura Str., Kharkiv 61085, Ukraine
  • V.V. Glamazdin A. Usikov Institute of Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12 Acad. Proskura Str., Kharkiv 61085, Ukraine
  • R. Prozorov Department of Physics and Astronomy, Iowa State University, Ames IA 50011, USA
  • P.C. Canfield Department of Physics and Astronomy, Iowa State University, Ames IA 50011, USA
  • V.N. Skresanov A. Usikov Institute of Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12 Acad. Proskura Str., Kharkiv 61085, Ukraine
  • S.A. Vitusevich Peter Grьnberg Institut, Forschungszentrum Juelich, 1 Leo-Brandt Str., Juelich 52425, Germany
  • M.A. Tanatar Ames Laboratory USDOE, Ames IA 50011, USA
  • N. Ni Department of Physics and Astronomy, Iowa State University, Ames IA 50011, USA
  • N.T. Cherpak A. Usikov Institute of Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12 Acad. Proskura Str., Kharkiv 61085, Ukraine
  • and K.I. Torokhtii Physical Engineering Department, National Technical Institute "KhPI" 21 Frunze Str., Kharkiv 61002, Ukraine

DOI:

https://doi.org/10.1063/1.3660321

Ключові слова:

Fe-pnictide, single crystal, surface microwave impedance, London penetration depth, temperature dependence.

Анотація

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 Boltzman coefficient) exponential dependence.

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Опубліковано

2011-06-21

Як цитувати

(1)
Barannik, A.; Glamazdin, V.; Prozorov, R.; Canfield, P.; Skresanov, V.; Vitusevich, S.; Tanatar, M.; Ni, N.; Cherpak, N.; Torokhtii, and K. Millimeter-Wave Study of London Penetration Depth Temperature Dependence in Ba(Fe0.926Co0.074)2As2 Single Crystal. Fiz. Nizk. Temp. 2011, 37, 912-915.

Номер

Том 37 № 8 (2011)

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