SUPERCONDUCTING NaFe1-xCoxAs: CRYSTAL GROWTH, RESISTIVITY, AND SUSCEPTIBILITY MEASUREMENTS

Tucker Netherton

Abstract

NaFe_1-xCo_xAs is a Cobalt doped iron-based superconductor (Co-doped FeSC). Compounds with compositions x= 0.0, 0.01, 0.015, 0.02, 0.025, 0.03, 0.04, 0.05, 0.06, 0.1, 0.11, and 0.12 were grown at the University of Tennessee and examined with magnetic susceptibility and resistivity measurements. These measurements were performed to insure compound purity and composition for use in neutron scattering. Antiferromagetic ordering, structural transition, and superconducting behavior under doping are briefly examined for further detail. The data obtained maps the phase diagram for NaFe_1-xCo_xAs as a function of doping and is compared to phase diagrams found from previous neutron scattering experiments found in the literature.