Abstract
A detailed quantitative study of the pnictide composite superconductor (CS) Ba0.6K0.4Fe2As2 is presented in the frame-work of the recently derived set of generalized BCS equations. Invoking multiple Debye temperatures to take into account anisotropy of the CS, we address the current experimental data on its Tc and the (not so clear-cut) gap-values via different theoretical scenarios that attempt to identify the ion species responsible for pairing in it. This is done with the aid of the Bogoliubov’s restriction on the BCS dimensionless electron-phonon coupling constant. Significantly, our study sheds light on the gaps which have recently been observed in different iron-pnictide CSs as nodes or line-nodes on the Fermi surface and have evinced considerable interest.
Highlights
Iron-pnictide superconductors (SCs) [1,2,3,4] constitute a promising new family because its members have rather high critical temperatures (Tcs); they readily allow a variety of chemical substitutions to be made
We present in this paper the results of a detailed study, based on the new framework of the generalized BCS equations (GBCSEs) [5], concerned with a prominent member of the family, namely Ba0.6K0.4Fe2As2 (Ba-As )
The present study and earlier work [14,15] suggests that in applying GBCSEs, Tc should be taken as the temperature which marks the onset of the said drop
Summary
Iron-pnictide superconductors (SCs) [1,2,3,4] constitute a promising new family because its members have rather high critical temperatures (Tcs); they readily allow a variety of chemical substitutions to be made. These attributes of the family suggest the possibility in the foreseeable future of fabricating SCs that might meet specific technological needs. It is imperative to develop a theoretical understanding of these materials To this end, we present in this paper the results of a detailed study, based on the new framework of the generalized BCS equations (GBCSEs) [5], concerned with a prominent member of the family, namely Ba0.6K0.4Fe2As2 (Ba-As ).
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