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Flux pinning and vortex transitions in doped BaFe2As2 single crystals

Journal Article


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Abstract


  • The vortex liquid-to-glass transition has been studied in Ba0.72K0.28Fe2As2 (BaK-122),

    Ba(Fe0.91Co0.09)2As2(BaCo-122), and Ba(Fe0.95Ni0.05)2As2(BaNi-122) single crystal with superconducting

    transition temperature, Tc¼31.7, 17.3, and 18 K, respectively, by magnetoresistance

    measurements. For temperatures below Tc, the resistivity curves were measured in magnetic fields

    within the range of 0B13 T, and the pinning potential was scaled according to a modified

    model for vortex liquid resistivity. Good scaling of the resistivity q(B, T) and the effective pinning

    energy U0(B,T) were obtained. The vortex state is three-dimensional at temperatures lower than a

    characteristic temperature T*. The vortex phase diagram was determined based on the evolution of

    the vortex-glass transition temperature Tg with magnetic field and the upper critical field, Hc2. We

    found that non-magnetic K doping results in a high glass line close to the Hc2, while magnetic Ni

    and Co doping causes a low glass line which is far away from the Hc2. Our results suggest that

    non-magnetic induced disorder is more favourable for enhancement of pinning strength compared

    to magnetic induced disorder. Our results show that the pinning potential is responsible for the

    difference in the glass states.

UOW Authors


  •   Ghorbani, Shaban (external author)
  •   Wang, Xiaolin
  •   Shahbazi, Mahboobeh (external author)
  •   Dou, Shi
  •   Choi, Ki-Young (external author)
  •   Lin, C T. (external author)

Publication Date


  • 2012

Citation


  • Ghorbani, S. R., Wang, X., Shahbazi-Manshadi, M., Dou, S. X., Choi, K. & Lin, C. T. (2012). Flux pinning and vortex transitions in doped BaFe2As2 single crystals. Applied Physics Letters, 100 (7), 072603-1-072603-4.

Scopus Eid


  • 2-s2.0-84863166060

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1529&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/529

Has Global Citation Frequency


Start Page


  • 072603-1

End Page


  • 072603-4

Volume


  • 100

Issue


  • 7

Place Of Publication


  • United States

Abstract


  • The vortex liquid-to-glass transition has been studied in Ba0.72K0.28Fe2As2 (BaK-122),

    Ba(Fe0.91Co0.09)2As2(BaCo-122), and Ba(Fe0.95Ni0.05)2As2(BaNi-122) single crystal with superconducting

    transition temperature, Tc¼31.7, 17.3, and 18 K, respectively, by magnetoresistance

    measurements. For temperatures below Tc, the resistivity curves were measured in magnetic fields

    within the range of 0B13 T, and the pinning potential was scaled according to a modified

    model for vortex liquid resistivity. Good scaling of the resistivity q(B, T) and the effective pinning

    energy U0(B,T) were obtained. The vortex state is three-dimensional at temperatures lower than a

    characteristic temperature T*. The vortex phase diagram was determined based on the evolution of

    the vortex-glass transition temperature Tg with magnetic field and the upper critical field, Hc2. We

    found that non-magnetic K doping results in a high glass line close to the Hc2, while magnetic Ni

    and Co doping causes a low glass line which is far away from the Hc2. Our results suggest that

    non-magnetic induced disorder is more favourable for enhancement of pinning strength compared

    to magnetic induced disorder. Our results show that the pinning potential is responsible for the

    difference in the glass states.

UOW Authors


  •   Ghorbani, Shaban (external author)
  •   Wang, Xiaolin
  •   Shahbazi, Mahboobeh (external author)
  •   Dou, Shi
  •   Choi, Ki-Young (external author)
  •   Lin, C T. (external author)

Publication Date


  • 2012

Citation


  • Ghorbani, S. R., Wang, X., Shahbazi-Manshadi, M., Dou, S. X., Choi, K. & Lin, C. T. (2012). Flux pinning and vortex transitions in doped BaFe2As2 single crystals. Applied Physics Letters, 100 (7), 072603-1-072603-4.

Scopus Eid


  • 2-s2.0-84863166060

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1529&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/529

Has Global Citation Frequency


Start Page


  • 072603-1

End Page


  • 072603-4

Volume


  • 100

Issue


  • 7

Place Of Publication


  • United States