Effect of annealing on the specific heat of optimally doped Ba(Fe$_{0.92}$Co$_{0.08}$)$_{2}$As$_{2}$

K. Gofryk; A. S. Sefat; M. A. McGuire; B. C. Sales; D. Mandrus; T. Imai; J. D. Thompson; E. D. Bauer; F. Ronning

doi:10.1088/1742-6596/273/1/012094

paper

Effect of annealing on the specific heat of optimally doped Ba(Fe $_{0.92}$ Co $_{0.08}$ ) $_{2}$ As $_{2}$

arXiv:1009.0954 · doi:10.1088/1742-6596/273/1/012094

Abstract

We report the temperature dependence of the low-temperature specific heat down to 400 mK of the electron-doped Ba(Fe $_{0.92}$ Co $_{0.08}$ ) $_{2}$ As $_{2}$ superconductors. We have measured two samples extracted from the same batch: first sample has been measured just after preparation with no additional heat treatment. The sample shows $T_{c}$ =20 K, residual specific heat $γ_{0}$ =3.6 mJ/mol K $^{2}$ and a Schottky-like contribution at low temperatures. A second sample has been annealed at 800 $^{o} C$ for two weeks and shows $T_{c}$ = 25 K and $γ_{0}$ =1.4 mJ/mol~K $^{2}$ . By subtracting the lattice specific heat, from pure BaFe $_{2}$ As $_{2}$ , the temperature dependence of the electronic specific heat has been obtained and studied. For both samples the temperature dependence of $C_{e l} (T)$ clearly indicate the presence of low-energy excitations in the system. Their specific heat data cannot be described by single clean s- or d-wave models and the data requires an anisotropic gap scenario which may or may not have nodes

SCES 2010, 5 pages, 2 figures

Effect of annealing on the specific heat of optimally doped Ba(Fe $_{0.92}$ Co $_{0.08}$ ) $_{2}$ As $_{2}$

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Effect of annealing on the specific heat of optimally doped Ba(Fe0.92​Co0.08​)2​As2​

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Effect of annealing on the specific heat of optimally doped Ba(Fe $_{0.92}$ Co $_{0.08}$ ) $_{2}$ As $_{2}$