Single-crystal growth of iron-based superconductor La${}_{0.34}$Na${}_{0.66}$Fe${}_2$As${}_2$

Abstract

We report single-crystal growth of La${}_{0.34}$Na${}_{0.66}$Fe${}_2$As${}_2$ iron-based superconductor with the size of several millimeters. The samples were accidentally obtained in trying to grow LaFeAsO${}_{1-y}$F${}_y$ ( $y\ge$ 0.8 ) single crystals with NaAs and NaF flux. The sample shows both antiferromagnetic and structural transitions at 106 K. The superconducting transition temperature is about 27 K with the superconducting anisotropy of about 1.9. These values and the temperature dependence of the Hall coefficient suggest that La${}_{0.34}$Na${}_{0.66}$Fe${}_2$As${}_2$ belongs to hole-doped "122" families of iron pnictides with the doping level slightly lower than optimal doping. Compared with previous reports on the polycrystalline samples, our results suggest that either $T_c$ of the this system can be further increased, or the superconducting dome may not be well formed in this system. In either case, the La${}_{0.5-x}$Na${}_{0.5+x}$Fe${}_2$As${}_2$ system provides a new platform to study the antiferromagnetic and superconducting properties of iron-based superconductors.

arXiv comment11 pages, 5 figures

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Cited by in corpus (3)

• Strong pinning in the hole-doped pnictide superconductor La${}_{0.34}$Na${}_{0.66}$Fe${}_2$As${}_2$
• Vortex lattices and critical fields in anisotropic superconductors
• Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe${}_{0.875}$Ti${}_{0.125}$)${}_2$As${}_2$