Using controlled disorder to distinguish s± and s++ gap structure in Fe-based superconductors

Y. Wang; A. Kreisel; P. J. Hirschfeld; V. Mishra

doi:10.1103/PhysRevB.87.094504

← Back to search

Using controlled disorder to distinguish s± and s++ gap structure in Fe-based superconductors

Y. Wang, A. Kreisel, P. J. Hirschfeld, V. Mishra

DOI 10.1103/PhysRevB.87.094504 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We reconsider the effect of disorder on the properties of a superconductor characterized by a sign-changing order parameter appropriate for Fe-based materials. Within a simple two-band model, we calculate simultaneously Tc, the change in residual resistivity Δρ0, and the zero-energy density of states, and show how these results change for various types of gap structure and assumptions regarding the impurity scattering. The rate of Tc suppression is shown to vary dramatically according to details of the impurity model considered. We search therefore for a practical, experimentally oriented signature of a gap of the s± type, and propose that observation of a particular evolution of the penetration depth, nuclear magnetic resonance relaxation rate, or thermal conductivity temperature dependence with disorder would suffice.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown