Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency

Abstract

We report the realization of superconductivity by an isovalent doping with phosphorus in LaFeAsO. X-ray diffraction shows that, with the partial substitution of P for As, the Fe${}_2$As${}_2$ layers are squeezed while the La${}_2$O${}_2$ layers are stretched along the c-axis. Electrical resistance and magnetization measurements show emergence of bulk superconductivity at $\sim$10 K for the optimally-doped LaFeAs${}_{1-x}$P${}_x$O ($x=0.25\sim 0.3$). The upper critical fields at zero temperature is estimated to be 27 T, much higher than that of the LaFePO superconductor. The occurrence of superconductivity is discussed in terms of chemical pressures and bond covalency.

5 pages, 6 figures, more data presented

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• Th substituted SmFeAsO: structural details and superconductivity with Tc above 50 K
• Heavy Fermion Quantum Criticality and Destruction of the Kondo Effect in a Nickel Oxypnictide
• Emergence of Novel Antiferromagnetic Order Intervening between Two Superconducting Phases in LaFe(As_1-x_P_x_)O: 31P-NMR Studies
• Evolution of the Phase Diagram of LaFeP${}_{1-x}$As${}_x$O${}_{1-y}$F${}_y$ ($y$ = 0 -- 0.1)
• Ferromagnetism and superconductivity in P-doped CeFeAsO
• Magnetic Properties of Ab initio Model for Iron-Based Superconductors LaFeAsO
• Anisotropic electrical resistivity of LaFeAsO: evidence for electronic nematicity
• Superconductivity and Phase Diagram in (Li${}_{0.8}$Fe${}_{0.2}$)OHFeSe${}_{1-x}$S${}_x$
• Superfluid density and superconducting gaps of RbFe_{2}As_{2} as a function of hydrostatic pressure
• Quantum oscillations of the superconductor LaRu${}_2$P${}_2$ : comparable mass enhancement $\lambda \approx 1$ in Ru and Fe phosphides
• Lessons from Oxypnictide Thin Films
• Origin of the non-monotonic variance of Tc in the 1111 iron based superconductors with isovalent doping
• Origin of doping-induced suppression and reemergence of magnetism in LaFeAsO${}_{1-x}$H${}_x$
• Structural and superconducting properties in LaFeAs1-xSbxO1-yFy
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• The calcium doping effects on the structural and electrical properties of NdFeAsO0.8F0.2