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Angular Dependence of Fluctuation Conductivity in BaFe1.9Co0.1As2 Single Crystal

Journal Article


Abstract


  • Fluctuation conductivity of electron-doped BaFe1.9Co0.1As2 single crystal is investigated by measurement of electrical resistivity under magnetic fields up to 13 T at different angles of θ = 0̊, 45̊ and 90̊ near mean-field transition temperature, where θ is the angle between the applied magnetic field and the axis perpendicular to the ab plane. The mean-field transition temperature is determined using the peak of dR/dT curves. Using the Aslamazov–Larkin theory, four main regions are identified corresponding to 3D, 2D, 1D, and SW regions, respectively, for each angle at different magnetic fields. The 1D region is a sign of conducting charge strips that are believed that these 1D conducting strips might be responsible for the occurrence of high-temperature superconductivity. Anisotropy increases as it approaches Tc, suggesting unconventional superconductivity that might be due to multiband effects in crystal. Results show that the zero-temperature coherence length in the c-direction ξ(0), the effective distance between the conducting layers d, and the channel cross section s decrease with increase in the magnetic field.

Publication Date


  • 2020

Citation


  • Asiyaban, M., Ghorbani, S. R., Mirnia, S. N., & Wang, X. L. (2020). Angular Dependence of Fluctuation Conductivity in BaFe1.9Co0.1As2 Single Crystal. Journal of Superconductivity and Novel Magnetism, 33(8), 2535-2541. doi:10.1007/s10948-020-05514-1

Scopus Eid


  • 2-s2.0-85084482814

Start Page


  • 2535

End Page


  • 2541

Volume


  • 33

Issue


  • 8

Abstract


  • Fluctuation conductivity of electron-doped BaFe1.9Co0.1As2 single crystal is investigated by measurement of electrical resistivity under magnetic fields up to 13 T at different angles of θ = 0̊, 45̊ and 90̊ near mean-field transition temperature, where θ is the angle between the applied magnetic field and the axis perpendicular to the ab plane. The mean-field transition temperature is determined using the peak of dR/dT curves. Using the Aslamazov–Larkin theory, four main regions are identified corresponding to 3D, 2D, 1D, and SW regions, respectively, for each angle at different magnetic fields. The 1D region is a sign of conducting charge strips that are believed that these 1D conducting strips might be responsible for the occurrence of high-temperature superconductivity. Anisotropy increases as it approaches Tc, suggesting unconventional superconductivity that might be due to multiband effects in crystal. Results show that the zero-temperature coherence length in the c-direction ξ(0), the effective distance between the conducting layers d, and the channel cross section s decrease with increase in the magnetic field.

Publication Date


  • 2020

Citation


  • Asiyaban, M., Ghorbani, S. R., Mirnia, S. N., & Wang, X. L. (2020). Angular Dependence of Fluctuation Conductivity in BaFe1.9Co0.1As2 Single Crystal. Journal of Superconductivity and Novel Magnetism, 33(8), 2535-2541. doi:10.1007/s10948-020-05514-1

Scopus Eid


  • 2-s2.0-85084482814

Start Page


  • 2535

End Page


  • 2541

Volume


  • 33

Issue


  • 8