Superconductivity in NdFe1-xCoxAsO (0.05 < x < 0.20) and rare-earth magnetic ordering in NdCoAsO

Abstract

The phase diagram of NdFe1-xCoxAsO for low cobalt substitution consists of a superconducting dome (0.05 < x < 0.20) with a maximum critical temperature of 16.5(2) K for x = 0.12. The x = 1 end member, NdCoAsO, is an itinerant ferromagnet (TC = 85 K) with an ordered moment of 0.30(1) BM at 15 K. Below TN = 9 K, Nd spin-ordering results in the antiferromagnetic coupling of the existing ferromagnetic planes. Rietveld analysis reveals that the electronically important two-fold tetrahedral angle increases from 111.4 to 115.9 deg. in this series. Underdoped samples with x = 0.046(2) and x = 0.065(2) show distortions to the orthorhombic Cmma structure at 72(2) and 64(2) K, respectively. The temperature dependences of the critical fields Hc2(T) near Tc are linear with almost identical slopes of 2.3(1) T K-1 for x = 0.065(2), x = 0.118(2) and x = 0.172(2). The estimated critical field Hc2(0) and correlation length for optimally doped samples are 26(1) T and 36(1) Angstrom. A comparison of the maximum reported critical temperatures of well-characterized cobalt doped 122- and 1111-type superconductors is presented.

accepted to PRB

References in corpus (30)

• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
• Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
• Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
• Superconductivity in Co-doped LaFeAsO
• Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation
• Superconductivity in SrFe_(2-x)Co_xAs_2: Internal Doping of the Iron Arsenide Layers
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Superconductivity induced by cobalt doping in iron-based oxyarsenides
• Effect of Co doping on superconductivity and transport properties in SmFe${}_{1-x}$Co${}_x$AsO
• A neutron scattering study of the interplay between structure and magnetism in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Itinerant Ferromagnetism in layered crystals LaCoOX (X = P, As)
• Neutron Studies of the Iron-based Family of High TC Magnetic Superconductors
• Structure and Magnetic Order in the NdFeAs(O,F) Superconductor System
• Magnetic Order of the Iron Spins in NdOFeAs
• Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
• Renormalized behavior and proximity to a magnetic quantum critical point in BaCo${}_2$As${}_2$
• Superconductivity above 50K in LnFeAsO1-y (Ln= Nd, Sm, Gd, Tb and Dy) Synthesized by High-pressure Technique
• Anisotropic magnetic and superconducting properties of pure and Co-doped CaFe${}_2$As${}_2$ single crystals
• The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs
• Structural and electronic response upon hole-doping of rare-earth iron oxyarsenides Nd1-xSrxFeAsO (0 < x < 0.2)
• Phonon Density of States in Nd(O${}_{1-x}$F${}_x$)FeAs
• Influence of the Nd $4f$ states on the magnetic behavior and the electric field gradient of the oxypnictides superconductors NdFeAsO${}_{1-x}$F${}_x$

Cited by in corpus (32)

• High-pressure flux growth, structural, and superconducting properties of LnFeAsO (Ln = Pr, Nd, Sm) single crystals
• A variable temperature study of the crystal and magnetic structures of the giant magnetoresistant materials LnMnAsO (Ln = La, Nd)
• Isoelectronic Ru substitution at Fe-site in Sm(Fe1-xRux)As(O0.85F0.15) compound and its effects on structural, superconducting and normal state properties
• Two successive field-induced spin-flop transitions in single-crystalline CaCo${}_2$As${}_2$
• The phase diagrams of iron-based superconductors: theory and experiments
• Interplay between Fe and Nd magnetism in NdFeAsO single crystals
• Nd induced Mn spin-reorientation transition in NdMnAsO
• Pressure versus concentration tuning of the superconductivity in Ba(Fe(1-x)Cox)2As2
• Magnetic Phase Transitions in NdCoAsO
• Short- and long-range magnetic order in LaMnAsO
• Magnetic phase transitions in SmCoAsO
• Local moments and symmetry breaking in metallic PrMnSbO
• Common effect of chemical and external pressures on the magnetic properties of RECoPO (RE = La, Pr)
• Synthesis, magnetization and magneto transport study of RECoPO (RE = La, Nd & Sm)
• Tunable interplay between 3d and 4f electrons in Co-doped iron pnictides
• Large Magnetoresistance Effects in $Ln$CoAsO with a Ferromagnetic-Antiferromagnetic Transition
• Intriguing complex magnetism of Co in RECoAsO (RE=La, Nd and Sm)
• Magnetic phase diagram in the Co-rich side of LnCo1-xFexAsO (Ln=La, Sm) system
• Iron spin-reorientation transition in NdFeAsO
• Competing magnetic phases and field-induced dynamics in DyRuAsO
• Direct evidence for the magnetic ordering of Nd ions in NdFeAsO by high resolution inelastic neutron scattering
• Structural and Magnetic Phase Transitions in NdCoAsO under High Pressures
• Anisotropic spin-fluctuations in SmCoPO revealed by 31^P NMR measurement
• Common effect of chemical and external pressures on the magnetic properties of $R$CoPO ($R$ = La, Pr, Nd, Sm). II
• Interplay of Sm4f and Co3d spins in SmCoAsO
• Iron substitution in NdCoAsO: crystal structure and magnetic phase diagram
• Antimony Doping Effect on the Superconducting Properties of SmFeAs(O,F)
• Improvement in granularity of NdFeAsO0.8F0.2 superconductor through Ag doping
• Tuning the magnetocrystalline anisotropy in $R$CoPO by means of $R$ substitution: a ferromagnetic resonance study
• Superconducting Mechanism through direct and redox layer doping in Pnictides
• Evolution of superconductivity in PrFe1-xCoxAsO with x = 0.0 to 1.0
• Magnetocrystalline anisotropic effect in GdCo${}_{1-x}$Fe${}_x$AsO ($x=0,0.05$)