Physics – Condensed Matter – Superconductivity
Scientific paper
2010-01-26
New Journal of Physics 12 (2010) 023006
Physics
Condensed Matter
Superconductivity
New Journal of Physics in press, 10 pages, 5 figures
Scientific paper
We report the field and temperature dependence of the low-temperature specific heat down to 400 mK and in magnetic fields up to 9 T of the electron-doped Ba(Fe0.92Co0.08)2As2 superconductor. Using the phonon specific heat obtained from pure BaFe2As2 we find the normal state Sommerfeld coefficient to be 18 mJ/mol.K^2 and a condensation energy of 1.27 J/mol. The temperature dependence of the electronic specific heat clearly indicate the presence of the low-energy excitations in the system. The magnetic field variation of field-induced specific heat cannot be described by single clean s- or d-wave models. Rather, the data require an anisotropic gap scenario which may or may not have nodes. We discuss the implications of these results.
Bauer Eric D.
Gofryk Krzysztof
Mandrus David
McGuire Michael A.
Ronning Filip
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