Calorimetric Evidence of Multiband Superconductivity in Ba(Fe0.925Co0.075)2As2

Details Calorimetric Evidence of Multiband Superconductivity in Ba(Fe0.925Co0.075)2As2 Calorimetric Evidence of Multiband Superconductivity in Ba(Fe0.925Co0.075)2As2

2009-10-26

arxiv.org/abs/0910.5006v1

Phys. Rev. B Rapid Comm. 81, 060501(R) (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

We report on the determination of the electronic heat capacity of a slightly overdoped (x = 0.075) Ba(Fe1-xCox)2As2 single crystal with a Tc of 21.4 K. Our analysis of the temperature dependence of the superconducting-state specific heat provides strong evidence for a two-band s-wave order parameter with gap amplitudes 2D1(0)/kBTc=1.9 and 2D2(0)/kBTc=4.4. Our result is consistent with the recently predicted s+- order parameter [I. I. Mazin et al., Phys. Rev. Lett. 101, 057003 (2008)].

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