Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

Systematic measurements of the resistivity, heat capacity, susceptibility and Hall coefficient are presented for single crystal samples of the electron-doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$. These data delineate an $x-T$ phase diagram in which the single magnetic/structural phase transition that is observed for undoped BaFe${}_2$As${}_2$ at 134 K apparently splits into two distinct phase transitions, both of which are rapidly suppressed with increasing Co concentration. Superconductivity emerges for Co concentrations above $x\sim 0.025$, and appears to coexist with the broken symmetry state for an appreciable range of doping, up to $x\sim 0.06$. The optimal superconducting transition temperature appears to coincide with the Co concentration at which the magnetic/structural phase transitions are totally suppressed, at least within the resolution provided by the finite step size between crystals prepared with different doping levels. Superconductivity is observed for a further range of Co concentrations, before being completely suppressed for $x\sim 0.018$ and above. The form of this $x-T$ phase diagram is suggestive of an association between superconductivity and a quantum critical point arising from suppression of the magnetic and/or structural phase transitions.

References in corpus (7)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Thermodynamic properties of Ba1-xMxFe2As2 (M = La and K)

Cited by in corpus (122)

• High-temperature superconductivity in iron-based materials
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• Magnetism in Fe-based superconductors
• Magnetically driven superconductivity in CeCu2Si2
• Hall effect and resistivity study of the magnetic transition, carrier content and Fermi liquid behavior in Ba(Fe(1-x) Cox)2As2
• Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
• Phase Diagram of Ba1-xKxFe2As2
• A neutron scattering study of the interplay between structure and magnetism in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2
• Superconductivity and spin-density-waves in multi-band metals
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• Evolution of the optical spectrum with doping in iron pnictides Ba(Fe1-xCox)2As2
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Electronic Structure of the BaFe${}_2$As${}_2$ Family of Iron Pnictides
• Transport properties and anisotropy of Rb0.8Fe2Se2 single crystals
• Hole and Electron Contributions to the Transport Properties of Ba(Fe_(1-x)Ru_x)_2As_2 Single Crystals
• Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties
• Quantum oscillations in the parent pnictide BaFe${}_2$As${}_2$ : itinerant electrons in the reconstructed state
• Coexistence and competition of the short-range incommensurate antiferromagnetic order with superconductivity in BaFe2-xNixAs2
• Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co and K doped iron pnictides
• Coexistence of Superconductivity and Charge Density Wave in SrPt2As2
• Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2
• Local measurement of the superfluid density in the pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ across the superconducting dome
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• Competing magnetic ground states in non-superconducting Ba(Fe1-xCrx)2As2
• Phase Diagram and Calorimetric Properties of NaFe${}_{1-x}$Co${}_x$As
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• Pressure versus concentration tuning of the superconductivity in Ba(Fe(1-x)Cox)2As2
• Dynamic competition between spin density wave order and superconductivity in underdoped $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
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• Muon spin rotation study of magnetism and superconductivity in Ba(Fe1-xCox)2As2 single crystals
• Stability of Quantum Critical Points in the Presence of Competing Orders
• Incommensurate spin density wave in Co-doped BaFe2As2
• Suppression of antiferromagnetic order and orthorhombic distortion in superconducting Ba(Fe0.961Rh0.039)2As2
• A high resolution, hard X-ray photoemission investigation of BaFe${}_2$As${}_2$: moderate influence of the surface and evidence for a low degree of Fe 3d - As 4p hybridization of the near-E${}_F$ electronic states
• Detailed band structure of twinned and detwinned BaFe${}_2$As${}_2$ studied with angle-resolved photoemission spectroscopy
• Nematic quantum criticality in an Fe-based superconductor revealed by strain-tuning
• Optical conductivity of iron-based superconductors
• Vortex Viscosity in Magnetic Superconductors Due to Radiation of Spin Waves
• The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
• Critical current and vortex dynamics in single crystals of Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Distinct high-T transitions in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Elastocaloric signature of nematic fluctuations
• Evolution of the Phase Diagram of LaFeP${}_{1-x}$As${}_x$O${}_{1-y}$F${}_y$ ($y$ = 0 -- 0.1)
• Dispersion of the superconducting spin resonance in underdoped and antiferromagnetic Ba(Fe1-xCox)2As2
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
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• An Electronic Nematic Liquid in BaNi${}_2$As${}_2$
• Anisotropic Non-Fermi Liquids
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• Phase-incoherent superconducting pairs in the normal state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
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• The evolution of antiferromagnetic susceptibility to uniaxial pressure in Ba(Fe{1-x}Co{x})2As2
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• Raman scattering as a probe of nematic correlations
• Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor
• Superconductivity and magnetism in platinum-substituted SrFe2As2 single crystals
• Upper critical field anisotropy in BaFe2-xCoxAs2 single crystals synthesized without flux
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• Critical Behavior of the SDW Transition in Underdoped Ba(Fe1-xCox)2As2 (x <=0.05): 75As NMR Investigation
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• The breakdown of both strange metal and superconducting states at a pressure-induced quantum critical point in iron-pnictide superconductors
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• NMR investigation of spin correlations in BaCo2As2
• Low temperature features in the heat capacity of unary metals and intermetallics for the example of bulk aluminum and Al${}_3$Sc
• The effect of Cr impurity to superconductivity in electron-doped BaFe2-xNixAs2
• First-principles study of superconducting Rare-earth doped CaFe2As2
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• Competing superconducting and magnetic order parameters and field-induced magnetism in electron doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr${}_{0.67}$Na${}_{0.33}$Fe${}_2$As${}_2$
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• Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides
• Electronic origin of structural transition in 122 Fe based superconductors
• Anisotropic optical properties of detwinned BaFe${}_2$As${}_2$
• Frequency-dependent sensitivity of AC elastocaloric effect measurements explored through analytical and numerical models
• Quantum critical fluctuations in an Fe-based superconductor
• Phase Diagram and Weak-link Behavior in Nd-doped CaFe_2As_2
• Advanced surface characterization of Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$ epitaxial thin films
• Anisotropic inplane spin correlation in the parent and Co-doped BaFe2As2: a neutron scattering study
• Thermoelectric signature of the nematic phase in iron-based superconductor
• Probing Local Variations of Superconductivity on the Surface of Ba(Fe1-xCox)2As2 Single Crystals
• Magnetoelastic coupling and charge correlation lengths in a twin domain of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ ($x=0.047$): A high-resolution X-ray diffraction study
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• Effect of transition-metal substitution in iron-based superconductors
• Ultrafast Relaxation Dynamics of Spin-Density Wave Order in BaFe${}_2$As${}_2$ under High Pressures
• A scanning quantum cryogenic atom microscope at 6 K
• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Quantitative relationship between structural orthorhombicity, shear modulus and heat capacity anomaly of the nematic transition in iron-based superconductors
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
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• The role of magnetic excitations in magnetoresistance and Hall effect of slightly TM-substituted BaFe${}_2$As${}_2$ compounds (TM = Mn, Cu, Ni)
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• Observation of the Dirac Dispersions in Co-doped CaFe2As2