Superconductivity in 122-type antimonide BaPt${}_2$Sb${}_2$

Abstract

The crystal structure, superconducting properties, and electronic structure of a novel superconducting 122-type antimonide, BaPt${}_2$Sb${}_2$, have been investigated by measurements of powder X-ray diffraction patterns, electrical resistivity, ac magnetic susceptibility, specific heat as well as ab-initio calculations. This material crystallizes in a new-type of monoclinic variant of the CaBe${}_2$Ge${}_2$-type structure, in which Pt${}_2$Sb${}_2$ layers consisting of PtSb${}_4$ tetrahedra and Sb${}_2$Pt${}_2$ layers consisting of SbPt${}_4$ tetrahedra are stacked alternatively and Ba atoms are located between the layers. Measurements of electrical resistivity, ac magnetic susceptibility and specific heat revealed that BaPt${}_2$Sb${}_2$ is a superconducting material with a $T_{\mathrm{c}}$ of 1.8 K. The electronic heat capacity coefficient ${\gamma }_{\mathrm{n}}$ and Debye temperature ${\theta }_{\mathrm{D}}$ were 8.6(2) mJ/mol K${}^2$ and 146(4) K, where the figures in parentheses represent the standard deviation. The upper critical field ${\mu }_0{H}_{c2}(0)$ and the Ginzburg-Landau coherent length $\xi (0)$ were determined to be 0.27 T and 35 nm. Calculations showed that it has two three-dimensional Fermi surfaces (FSs) and two two-dimensional FSs, leading to anisotropic transport properties. The d-states of the Pt atoms in the Pt2Sb2 layers mainly contribute to $N(E_{\mathrm{F}})$. A comparison between experimental and calculated results indicates that BaPt${}_2$Sb${}_2$ is a superconducting material with moderate coupling.

24 pages, 9 figures

References in corpus (24)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Gap symmetry and structure of Fe-based superconductors
• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• The Fermi surface of Ba(1-x)K(x)Fe2As2 and its evolution with doping
• First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals
• Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2
• Anisotropy of the upper critical field in a Co-doped BaFe2As2 single crystal
• Superconductivity in SrNi2As2 Single Crystals
• Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films
• Coexistence of Superconductivity and Charge Density Wave in SrPt2As2
• Density functional study of BaNi${}_2$As${}_2$: Electronic structure, phonons and electron-phonon superconductivity
• Superconductivity and the Effects of Pressure and Structure in Single Crystalline SrNi${}_2$P${}_2$
• Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe2As2
• Superconductivity in Layered Pnictides BaRh2P2 and BaIr2P2
• Electronic band structure, Fermi surface, and elastic properties of new 4.2K superconductor SrPtAs from first-principles calculations

Cited by in corpus (4)

• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• The coexistence of charge density wave and superconductivity in Pt-based layered superconductors : SrPt${}_2$As${}_2$ and LaPt${}_2$Si${}_2$
• Novel polymorphic phase of BaCu2As2: impact of flux for new phase formation in crystal growth
• Possibility of charge density wave transition in SrPt${}_2$Sb${}_2$ superconductor