Evolution of bulk superconductivity in SrFe2As2 with Ni substitution

Abstract

Single crystals of the Ni-doped FeAs-based superconductor SrFe2-xNixAs2 were grown using a self-flux solution method and characterized via x-ray measurements and low temperature transport, magnetization, and specific heat studies. A doping phase diagram has been established where the antiferromagnetic order associated with the magnetostructural transition of the parent compound SrFe2As2 is gradually suppressed with increasing Ni concentration, giving way to bulk-phase superconductivity with a maximum transition temperature of 9.8 K. The superconducting phase exists through a finite range of Ni concentrations centered at x=0.15, with full diamagnetic screening observed over a narrow range of x coinciding with a sharpening of the superconducting transition and an absence of magnetic order. An enhancement of bulk superconducting transition temperatures of up to 20% was found to occur upon high-temperature annealing of samples.

10 pages, 9 figures

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• Electron-hole asymmetry in Co- and Mn-doped SrFe2As2
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• Iron-platinum-arsenide superconductors Ca10(PtnAs8)(Fe2-xPtxAs2)5
• Superconductivity and magnetism in platinum-substituted SrFe2As2 single crystals
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• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
• Disorder effects in multiorbital $s_{\pm }$-wave superconductors: Implications for Zn-doped BaFe${}_2$As${}_2$ compounds
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• Effect of Ni-doping on magnetism and superconductivity in Eu0.5K0.5Fe2As2
• Annealing effects on superconductivity in SrFe2-xNixAs2
• Uniform chemical pressure effect in solid solutions Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2
• Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr${}_{0.67}$Na${}_{0.33}$Fe${}_2$As${}_2$
• Temperature-composition Phase Diagrams for Ba1-xSrxFe2As2 and Ba0.5Sr0.5(Fe1-yCoy)2As2
• Lattice Parameters Guide Superconductivity in Iron-Arsenides
• 57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe(2-x)Ni(x)As2
• Breakdown of Chemical Scaling for Pt-Doped CaFe2As2
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• Combined effects of Sr substitution and pressure on the ground states in CaFe${}_2$As${}_2$
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• Sustained phase separation and spin glass in Co-doped K${}_x$Fe${}_{2-y}$Se${}_2$ single crystals
• Magnetic disorder and gap symmetry in optimally electron doped Sr(Fe, Co)${}_2$As${}_2$ superconductor
• Pressure-driven phase transitions in correlated systems
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