Superconductivity up to 35 K in the iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 with layered structures

Abstract

We report the synthesis and crystal structures of three new superconducting iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 (x = 0-0.15, y = 0-0.4). The structures are stacking variants of FeAs- and slightly puckered Pt4-yAs8-layers with square coordinated platinum separated by calcium-layers, respectively. Arsenic atoms in the Pt4-yAs8-layers form (As2)4- dumbbells according to Zintl's concept, providing charge balance in (Ca2+Fe2+As3-)10(Pt2+)3[(As2)4-]4. Superconductivity was observed at 13-35 K. We suggest that the highest Tc above 30 K occurs in the 1048 phase with clean FeAs-layers that are indirectly electron-doped according to (Ca2+Fe2+As3-)10(Pt2+)4[(As2)4-]4*2e-. We also suggest that the lower critical temperatures occur in the 1038- and a-1048 phases due to Pt-doping at the Fe-site. DFT band structure calculations indicate that the contribution of the Pt4-yAs8-layers to the Fermi surface is small and that the Fermi energy is slightly either below or above a quasi-gap in the Pt-states. The new platinum-iron compounds represent the first iron-based superconductors with so far unknown structure types and can serve as a new platform for further studies that go beyond the known systems.

arXiv comment4 Pages, 5 Figures, Angew. Chem. Int. Ed. in press

References in corpus (10)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
• Transition of stoichiometricSr2VO3FeAs to a superconducting state at 37.2 K
• Structure and superconductivity of LiFeAs
• Non-stoichiometry and the magnetic structure of Sr2CrO3FeAs
• Suppression of superconductivity by V-doping and possible magnetic order in Sr2VO3FeAs
• Superconductivity in SrFe2As2 with Pt Doping

Cited by in corpus (42)

• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• Unconventional Superconductivity
• Superconductivity in Ca1-xLaxFeAs2: A Novel 112-Type Iron Pnictide with Arsenic Zigzag Bonds
• Discovery of New Layered Iron Arsenide Superconductor (Ca,Pr)FeAs2
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Superconducting Transition Temperatures of up to 47 K from Simultaneous Rare-Earth Element and Antimony Doping of 112-Type CaFeAs2
• Enhanced Superconductivity up to 43 K by P/Sb Doping of Ca1-xLaxFeAs2
• Synthesis and physical properties of Ca1-xRExFeAs2 with RE = La ~ Gd
• The role of different negatively charged layers in Ca10(Fe1-xPtxAs)10(Pt3+yAs8) and superconductivity at 30 K in electron-doped (Ca0.8La0.2)10(FeAs)10(Pt3As8)
• Doping - dependent superconducting gap anisotropy in the two-dimensional 10-3-8 pnictide Ca${}_{10}$(Pt${}_3$As${}_8$)[(Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$]${}_5$
• Anisotropic $H_{c2}$ determined up to 92 T and the signature of multi-band superconductivity in Ca${}_{10}$(Pt${}_4$As${}_8$)((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$ superconductor
• Fermi surface topology and low-lying electronic structure of a new iron-based superconductor Ca10(Pt3As8)(Fe2As2)5
• Why $T_c$ of (CaFeAs)${}_{10}$Pt${}_{3.58}$As${}_8$ is twice as high as (CaFe${}_{0.95}$Pt${}_{0.05}$As)${}_{10}$Pt${}_3$As${}_8$
• Transport Properties and Electronic Phase Diagram of Single-Crystalline Ca${}_{10}$(Pt${}_3$As${}_8$) ((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$
• Iron-platinum-arsenide superconductors Ca10(PtnAs8)(Fe2-xPtxAs2)5
• Magnetic and transport properties of iron-platinum arsenide Ca10(Pt4-δAs8)(Fe2-xPtxAs2)5 single crystal
• Temperature-concentration phase diagram of (Ca1-xLax)10(Pt3As8)(Fe2As2)5 superconductors
• Superconductivity in Ca10(Ir4As8)(Fe2As2)5 with Square-Planar Coordination of Iridium
• Correlation-induced self-doping in intercalated iron-pnictide superconductor Ba2Ti2Fe2As4O
• Large magnetic penetration depth and thermal fluctuations in a Ca${}_{10}$(Pt${}_3$As${}_8$)[(Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$]${}_5$ (x=0.097) single crystal
• Superconductivity and Crystal Structure of the Palladium-Iron-Arsenides Ca10(Fe1-xPdxAs)10Pd3As8
• Formation of the density wave energy gap in Na${}_2$Ti${}_2$Sb${}_2$O: an optical spectroscopy study
• Structural and magnetic phase transitions in triclinic Ca10(FeAs)10(Pt3As8)
• Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic (CaFe${}_{1-x}$Pt${}_x$As)${}_{10}$Pt${}_3$As${}_8$
• Superconductivity by rare earth doping in the 1038-type compounds (Ca${}_{1-x}$RE${}_x$)${}_{10}$(FeAs)${}_{10}$(Pt${}_3$As${}_8$) with RE = Y, La-Nd, Sm-Lu
• Quasi-2D behavior of 112-type iron-based superconductors
• Antiferromagnetic order in Ca${}_{10}$(Pt${}_3$As${}_8$)(Fe${}_2$As${}_2$)${}_5$ observed by ${}^{75}$As NMR
• Lattice distortion and stripe-like antiferromagnetic order in Ca10(Pt3As8)(Fe2As2)5
• Unfolding the electronic structure of Ca${}_{10}$(Fe${}_{1-x}$Pt${}_x$As)${}_{10}$(Pt${}_n$As${}_8$)
• Optical properties of the optimally doped Ca${}_{8.5}$La${}_{1.5}$(Pt${}_3$As${}_8$)(Fe${}_2$As${}_2$)${}_5$ single crystal
• Various arsenic network structures in 112-type Ca1-xLaxFe1-yPdyAs2 revealed by synchrotron x-ray diffraction experiments
• Fluctuation magnetoconductivity in pristine and protonirradiated Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystals
• Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
• Breakdown of Chemical Scaling for Pt-Doped CaFe2As2
• Interrogating the superconductor Ca10(Pt4As8)(Fe2-xPtxAs2)5 Layer-by-layer
• Anisotropies and Homogeneities of Superconducting Properties in Iron-Platinum-Arsenide Ca10(Pt3As8)(Fe1.79Pt0.21As2)5
• Coexistence of Bloch electrons and glassy electrons in Ca10(Ir4As8)(Fe2_xIrxAs2)5 revealed by angle-resolved photoemission spectroscopy
• Superconductivity by transition metal doping in Ca${}_{10}$(Fe${}_{1-x}$M${}_x$As)${}_{10}$(Pt${}_3$As${}_8$) (M = Co, Ni, Cu)
• Uncovering anisotropic magnetic phases via fast dimensionality analysis
• Suppression of superconductivity and structural phase transition against pressure in Ca${}_{10}$(Ir${}_4$As${}_8$)(Fe${}_{2-x}$Ir${}_x$As${}_2$)${}_5$
• Electronic structure and chemical bonding in novel tetragonal phase Ca10(Pt4As8)(Fe2As2)5 as a parent material for the new family of high-TC iron-pnictide superconductors
• Nodeless superconducting gaps in Ca${}_{10}$(Pt${}_{4-\delta }$As${}_8$)((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$ probed by quasiparticle heat transport