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

Wolf, T.; Loehneysen, H. v.; Schweiss, P.; Eder, R.; FISHER, R. A.; Adelmann, P.; Meingast, C.; Hardy, F.

doi:10.1103/PhysRevB.81.060501

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

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Author(s): F. Hardy , T. Wolf , R. A. Fisher , R. Eder , P. Schweiss , P. Adelmann , H. v. Loehneysen , C. Meingast

Publication date Created: 26 October 2009

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Abstract

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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Most cited references 14

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Iron-based layered superconductor La[O(1-x)F(x)]FeAs (x = 0.05-0.12) with T(c) = 26 K.

Yoichi Kamihara, Takumi Watanabe, Masahiro Hirano … (2008)

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Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx

I. Mazin, D. J. Singh, M. Johannes … (2008)

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Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO\(_{1-x}\)F\(_x\)}

Ryotaro Arita, Hidetomo Usui, Seiichiro Onari … (2008)

For a newly discovered iron-based high \(T_c\) superconductor LaFeAsO\(_{1-x}\)F\(_x\), we have constructed a minimal model, where inclusion of all the five Fe \(d\) bands is found to be necessary. Random-phase approximation is applied to the model to investigate the origin of superconductivity. We conclude that the multiple spin fluctuation modes arising from the nesting across the disconnected Fermi surfaces realize an extended s-wave pairing, while d-wave pairing can also be another candidate.