Effect of 3d Metal (Co and Ni) Doping on the Superconductivity of FeSe0.5Te0.5

Abstract

We report the effect of 3d metal Cobalt (Co) and Nickel (Ni) doping on the FeTe0.5Se0.5 superconductor with the nominal composition range Fe1-xMxTe0.5Se0.5 (M = Co, Ni and x = 0.00, 0.01 0.02, 0.05, and 0.10). Samples are synthesized through standard solid state reaction route and all are crystallize in single phase tetragonal structure with space group P4nmm. The lattice parameters 'a', 'c' and volume decrease with increase in Co and Ni content, although not monotonically. In fact the 'a' lattice parameter of Co doped samples is nearly unaffected for Co doped samples. The superconducting transition temperature (Tc) is measured from both DC and AC magnetic susceptibility, which decrease with increase in Ni or Co content. Both Co and Ni suppress Tc and drive the system into the normal state. Interestingly, Ni suppresses the superconductivity much faster than the Co. This indicates less effect on in-plane Fe-Se distances and thus reduced disorder in case of Co when compared with Ni substation at Fe site in FeTe0.5Se0.5 superconductor. It is concluded that in-plane disorder on superconducting Fe-Se and Fe-Se-Se planes directly affects superconductivity in FeTe0.5Se0.5 superconductor.

4 Pages Text + Figures; comments/suggestions ([email protected])

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Cited by in corpus (5)

• Importance of structural distortions in enhancement of transition temperature in FeSe${}_{1-x}$Te${}_x$ superconductors
• Cometal addition effect on superconducting properties and granular behaviours of polycrystalline FeSe0.5Te0.5
• Copper doping effects on the superconducting properties of Sm-based oxypnictides
• Effect of Pb addition on microstructure, transport properties and the critical current density in a polycrystalline FeSe0.5Te0.5
• Effect of electron doping in FeTe${}_{1-y}$Se${}_y$ realized by Co and Ni substitution