Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1-xK xFe2As2 (0.2≤x≤1.0) series

Sergey L. Bud'ko, Mihai Sturza, Duck Young Chung, Mercouri G. Kanatzidis, Paul C. Canfield

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Abstract

We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure jump in the heat capacity associated with the superconducting transition as a function of K doping in the Ba1-xKxFe2As2 family of iron-based superconductors. The pressure derivatives show a weak but distinct anomaly near x∼0.7. In the same concentration region, ΔC p|Tc deviates from the ΔCpâ̂T3 scaling found for most BaFe2As2-based superconductors. These results are consistent with a possible significant modification of the superconducting state, occurring near x∼0.7.

Original languageEnglish
Article number100509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number10
DOIs
Publication statusPublished - Mar 22 2013

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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