Specific heat discontinuity, Δc, at Tc in BaFe 2(As0.7P0.3)2 - Consistent with unconventional superconductivity

J. S. Kim, G. R. Stewart, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda

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38 Citations (Scopus)

Abstract

We report the specific heat discontinuity, ΔC/Tc, at Tc = 28.2K of a collage of single crystals of BaFe 2(As0.7P0.3)2 and compare the measured value of 38.5 mJmol- 1K- 2 with other iron pnictide and iron chalcogenide (FePn/Ch) superconductors. This value agrees well with the trend established by Bud'ko, Ni and Canfield, who found that for 14 examples of doped Ba1 - xKxFe2As2 and BaFe2 - xTMxAs2, where the transition metal TM = Co and Ni. We extend their analysis to include all the FePn/Ch superconductors for which ΔC/Tc is currently known and find and a = 0.083mJmol- 1K- 4. A comparison with the elemental superconductors with Tc > 1K and with A-15 superconductors shows that, contrary to the FePn/Ch superconductors, electron-phonon-coupled conventional superconductors exhibit a significantly different dependence of ΔC on Tc, namely . However ΔC/γTc appears to be comparable in all three classes (FePn/Ch, elemental and A-15) of superconductors with, for example, ΔC/γTc = 2.4 for BaFe2(As0.7P0.3)2. Adiscussion of the possible implications of these phenomenological comparisons for the unconventional superconductivity believed to exist in the FePn/Ch is given.

Original languageEnglish
Article number222201
JournalJournal of Physics Condensed Matter
Volume23
Issue number22
DOIs
Publication statusPublished - 2011
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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