Superconductivity at 23 K in Pt doped BaFe2As2 single crystals

Abstract

We report superconductivity in single crystals of the new iron-pnictide system BaFe1.9Pt0.1As2 grown by a self-flux solution method and characterized via x-ray, transport, magnetic and thermodynamic measurements. The magnetic ordering associated with a structural transition at 140 K present in BaFe2As2 is completely suppressed by substitution of 5% Fe with Pt and superconductivity is induced at a critical temperature Tc=23 K. Full diamagnetic screening in the magnetic susceptibility and a jump in the specific heat at Tc confirm the bulk nature of the superconducting phase. All properties of the superconducting state including transition temperature Tc, the lower critical field Hc1=200 mT, upper critical field Hc2~65 T, and the slope dHc2/dT are comparable in value to the those found in other transition-metal-substituted BaFe2As2 series, indicating the robust nature of superconductivity induced by substitution of Group VIII elements.

6 pgs, 4 figs, and 1 tbl, slightly revised, updated references

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• Effects of transition metal substitutions on the incommensurability and spin fluctuations in BaFe2As2 by elastic and inelastic neutron scattering
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• Transport Properties and Electronic Phase Diagram of Single-Crystalline Ca${}_{10}$(Pt${}_3$As${}_8$) ((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$
• Superconductivity induced by doping Platinum in BaFe2As2
• Electronic structure of single-crystalline Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ probed by x-ray absorption spectroscopy: Evidence for isovalent substitution of Fe${}^{2+}$ by Co${}^{2+}$
• Microscopic Coexistence of Magnetism and Superconductivity in charge compensated Ba1-xKx(Fe1-yCoy)2As2
• Superconductivity and magnetism in platinum-substituted SrFe2As2 single crystals
• Helical magnetic ordering in Sr(Co1-xNix)2As2
• Effect of the isoelectronic substitution of Sb for As on the magnetic and structural properties of LaFe(As1-xSbx)O
• High resolution x-ray scattering studies of structural phase transitions in Cr-doped BaFe2As2
• Magnetically polarized Ir dopant atoms in superconducting Ba(Fe${}_{1-x}$Ir${}_x$)${}_2$As${}_2$
• Uniform chemical pressure effect in solid solutions Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2
• Spin polarization of Ru in superconducting Ba(Fe${}_{0.795}$Ru${}_{0.205}$)${}_2$As${}_2$ studied by x-ray resonant magnetic scattering
• Incoherent electronic band states in Mn-substituted BaFe${}_2$As${}_2$
• Miscibility gap and possible intrinsic Griffiths phase in Sr(Fe1-xMnx)2As2 crystals grown by transitional metal arsenide flux
• Isotropic multi-gap superconductivity in BaFe1.9Pt0.1As2 from thermal transport and spectroscopic measurements
• Electronic signatures of successive itinerant, magnetic transitions in hexagonal La2Ni7
• Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy
• Emergence of the minority hole with high mobility on the electrical transport in the Fe-pnictides Ba(Fe${}_{1-x}$Mn${}_x$As)${}_2$
• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Structural and antiferromagnetic properties of Ba(Fe${}_{1-x-y}$Co${}_x$Rh${}_y$)${}_2$As${}_2$ compounds