Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-06
Phys. Rev. B 83, 064513 (2011)
Physics
Condensed Matter
Superconductivity
9 pages: added references, two figures and supplementary information; Accepted to Physical Review B (Jan 10, 2010)
Scientific paper
10.1103/PhysRevB.83.064513
We report on the effect of annealing on the temperature and field dependencies of the low temperature specific heat of the electron-doped Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ for under-(x = 0.045), optimal- (x = 0.08) and over-doped (x = 0.105 and 0.14) regimes. We observed that annealing significantly improves some superconducting characteristics in Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$. It considerably increases $T_{c}$, decreases $\gamma_{0}$ in the superconducting state and suppresses the Schottky-like contribution at very low temperatures. The improved sample quality allows for a better identification of the superconducting gap structure of these materials. We examine the effects of doping and annealing within a self-consistent framework for an extended s-wave pairing scenario. At optimal doping our data indicates the sample is fully gapped, while for both under and overdoped samples significant low-energy excitations possibly consistent with a nodal structure remain. The difference of sample quality offers a natural explanation for the variation in low temperature power laws observed by many techniques.
Bauer Eric D.
Gofryk Krzysztof
Imai Takayuki
Ronning Filip
Sefat Athena S.
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