Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]$_2$As$_2$

T. E. Kuzmicheva; V. A. Vlasenko; S. Yu. Gavrilkin; S. A. Kuzmichev; K. S. Pervakov; I. V. Roshchina; V. M. Pudalov

doi:10.1007/s10948-016-3816-4

Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]$_2$As$_2$

Superconductivity 2016-12-14 v1

Authors: T. E. Kuzmicheva , V. A. Vlasenko , S. Yu. Gavrilkin , S. A. Kuzmichev , K. S. Pervakov , I. V. Roshchina , V. M. Pudalov

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Abstract

We studied nearly optimally Ni-substituted BaFe $_{2-x}$ Ni $_x$ As $_2$ (BFNA) single crystals with $T_C \approx 18.5$ \,K. In irreversible magnetization measurements, we determined the field dependence of the critical-current density and discuss the nature of observed strong bulk pinning. Using intrinsic multiple Andreev reflections effect (IMARE) spectroscopy, we directly determine two distinct superconducting gaps and resolve their moderate anisotropy in the momentum space. The BCS-ratio for the large gap $2\Delta_L/k_BT_C > 4.1$ evidences for a strong coupling in the $\Delta_L$ -bands.

Keywords

high-temperature superconductivity single crystal superconductivity iron-based superconductor

Cite

@article{arxiv.1608.01649,
  title  = {Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]$_2$As$_2$},
  author = {T. E. Kuzmicheva and V. A. Vlasenko and S. Yu. Gavrilkin and S. A. Kuzmichev and K. S. Pervakov and I. V. Roshchina and V. M. Pudalov},
  journal= {arXiv preprint arXiv:1608.01649},
  year   = {2016}
}

Comments

6 pages, 4 figures. To be published in Proceedings of Superstripes 2016 Conference

Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]$_2$As$_2$

Abstract

Keywords

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