Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-07-28
Phys. Rev. Lett. 106, 087004 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures. Paper accepted for publication in Physical Review Letters. Contact author: Nai-Chang Yeh (ncyeh@caltech.ed
Scientific paper
10.1103/PhysRevLett.106.087004
Scanning tunneling spectroscopic studies of $Ba(Fe_{1-x}Co_x)_2As_2$ (x = 0.06, 0.12) single crystals reveal direct evidence for predominantly two-gap superconductivity. These gaps decrease with increasing temperature and vanish above the superconducting transition $T_c$. The two-gap nature and the slightly doping- and energy-dependent quasiparticle scattering interferences near the wave-vectors $(\pm \pi, 0)$ and $(0, \pm \pi)$ are consistent with sign-changing $s$-wave superconductivity. The excess zero-bias conductance and the large gap-to-$T_c$ ratios suggest dominant unitary impurity scattering.
Cheng Peiling
Drayna G. K.
Lockhart G. P.
Shen Bai-fei
Teague M. L.
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