Phys. Rev. B 79, 220516(R) (2009) [4 pages]Jump in specific heat at the superconducting transition temperature in Ba(Fe1−xCox)2As2 and Ba(Fe1−xNix)2As2 single crystals
We present detailed heat capacity measurements for Ba(Fe1−xCox)2As2 and Ba(Fe1−xNix)2As2 single crystals in the vicinity of the superconducting transitions. The specific-heat jump at the superconducting transition temperature (Tc), ΔCp/Tc, changes by a factor of ∼10 across these series. The ΔCp/Tc vs Tc data of this work [together with the literature data for Ba(Fe0.939Co0.061)2As2, (Ba0.55K0.45)Fe2As2, and (Ba0.6K0.4)Fe2As2] scale well to a single log-log plot over two orders of magnitude in ΔCp/Tc and over about an order of magnitude in Tc, giving ΔCp/Tc∝Tc2. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.220516
DOI:
10.1103/PhysRevB.79.220516
PACS:
74.25.Bt, 74.62.Dh, 74.70.Dd
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