Phase diagram and physical properties of NaFe${}_{1-x}$Cu${}_x$As single crystals

Abstract

A series of high quality NaFe${}_{1-x}$Cu${}_x$As single crystals has been grown by a self-flux technique, which were systematically characterized via structural, transport, thermodynamic, and high pressure measurements. Both the structural and magnetic transitions are suppressed by Cu doping, and bulk superconductivity is induced by Cu doping. Superconducting transition temperature ($T_c$) is initially enhanced from 9.6 to 11.5 K by Cu doping, and then suppressed with further doping. A phase diagram similar to NaFe${}_{1-x}$Co${}_x$As is obtained except that insulating instead of metallic behavior is observed in extremely overdoped samples. $T_c$'s of underdoped, optimally doped, and overdoped samples are all notably enhanced by applying pressure. Although a universal maximum transition temperature ($T_c^{max}$) of about 31 K under external pressure is observed in underdoped and optimally doped NaFe${}_{1-x}$Co${}_x$As, $T_c^{max}$ of NaFe${}_{1-x}$Cu${}_x$As is monotonously suppressed by Cu doping, suggesting that impurity potential of Cu is stronger than Co in NaFeAs. The comparison between Cu and Co doping effect in NaFeAs indicates that Cu serves as an effective electron dopant with strong impurity potential, but part of the doped electrons are localized and do not fill the energy bands as predicted by the rigid-band model.

9 pages, 10 pages

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• Orbital-selective coherence-incoherence crossover and metal-insulator transition in Cu-doped NaFeAs
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• Stripe Antiferromagnetism and Disorder in the Mott Insulator NaFe${}_{1-x}$Cu${}_x$As ($x\lesssim 0.5$)
• Disappearance and Survival of Superconductivity in FeSe under High Pressure
• Electronic and spin dynamics in the insulating iron pnictide NaFe${}_{0.5}$Cu${}_{0.5}$As
• Toward the Mott state with Magnetic Cluster Formation in Heavily Cu-Doped NaFe${}_{1-x}$Cu${}_x$As
• Spin dynamics in NaFeAs and NaFe${}_{0.53}$Cu${}_{0.47}$As probed by resonant inelastic X-ray scattering
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• Orbital-selective Mott phase of Cu-substituted iron-based Superconductors
• Fluctuating magnetism of Co- and Cu-doped NaFeAs
• Crossover of Superconductivity across the antiferromagnetic end point in FeSe${}_{1-\mathrm{x}}$S${}_{\mathrm{x}}$ under pressure
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• Quasi-one-dimensional spin excitations in the iron pnictide NaFe${}_{0.53}$Cu${}_{0.47}$As