Jump in specific heat in the presence of a spin-density wave at the superconducting transition in iron pnictides

M. G. Vavilov, A. V. Chubukov, A. B. Vorontsov

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Many experiments reveal that in iron-based superconductors the jump of the specific heat ΔC at the superconducting Tc is not proportional to Tc, as expected in BCS theory. Rather, ΔC/Tc varies with Tc, and has a peak near optimal doping and decreases at smaller and larger dopings. We show that this behavior can be naturally explained by the interplay between superconductivity and antiferromagnetism. We demonstrate on general grounds that ΔC/Tc peaks at the doping where the coexistence phase with antiferromagnetism develops, and decreases at deviations from this doping in both directions. Our results are in quantitative agreement with the experiments.

Original languageEnglish (US)
Article number140502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number14
DOIs
StatePublished - Oct 7 2011
Externally publishedYes

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