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

Abstract

Single crystalline samples of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ with $x<0.12$ have been grown and characterized via microscopic, thermodynamic and transport measurements. With increasing Co substitution, the thermodynamic and transport signatures of the structural (high temperature tetragonal to low temperature orthorhombic) and magnetic (high temperature non magnetic to low temperature antiferromagnetic) transitions are suppressed at a rate of roughly 15 K per percent Co. In addition, for $x\ge 0.038$ superconductivity is stabilized, rising to a maximum $T_c$ of approximately 23 K for $x\approx 0.07$ and decreasing for higher $x$ values. The $T-x$ phase diagram for Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ indicates that either superconductivity can exist in both low temperature crystallographic phases or that there is a structural phase separation. Anisotropic, superconducting, upper critical field data ($H_{c2}(T)$) show a significant and clear change in anisotropy between samples that have higher temperature structural phase transitions and those that do not. These data show that the superconductivity is sensitive to the suppression of the higher temperature phase transition.

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• NMR investigation of spin correlations in BaCo2As2
• Evidence of unconventional low-frequency dynamics in the normal phase of Ba(Fe1-xRhx)2As2 iron-based supercondutors
• Commensurate antiferromagnetic ordering in Ba(Fe{1-x}Co{x})2As2 determined by x-ray resonant magnetic scattering at the Fe K-edge
• Nanoscale textured superconductivity in Ru-substituted BaFe2As2 : a challenge to a universal phase diagram for the pnictides
• ${}^{75}$As NMR of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ in High Magnetic Field
• Doping and critical-temperature dependence of the energy gaps in Ba(Fe_{1-x}Co_x)_2As_2 thin films
• Direct spectroscopic evidence for completely filled Cu $3d$ shell in BaCu${}_2$As${}_2$ and $\alpha$-BaCu${}_2$Sb${}_2$
• Crossover from spin-waves to diffusive spin excitations in underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Field-driven transition in the Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ superconductor with splayed columnar defects
• Improving quantum-transition temperatures in BaFe2As2-based crystals by removing local-lattice strain & electronic-structure disorder
• Thermal expansion of CaFe2As2: effect of cobalt doping and post-growth thermal treatment
• Antiferromagnetic spin correlations and pseudogap-like behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity
• Spin fluctuation anisotropy as a probe of orbital-selective hole-electron quasiparticle excitations in detwinned Ba(Fe1-xCox)2As2
• Anisotropic thermal expansion of AEFe2As2 (AE = Ba, Sr, Ca) single crystals
• Superconducting phase diagrams of cuprates and pnictides as a key to the HTSC mechanism
• Separation of antiferromagnetism and high-temperature superconductivity in Ca${}_{1-x}$La${}_x$Fe${}_2$As${}_2$ under pressure
• Restoration of tetragonal $C_4$ symmetry coexistent with filamentary superconductivity in the pressure induced intermediate phase in the iron-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Effect of SDW fluctuations on the specific heat jump in iron pnictides at a superconducting transition
• Evidence for Coexistence of Superconductivity and Magnetism in Single Crystals of Co-doped SrFe${}_2$As${}_2$
• Thermoelectric power of Ba(Fe1-xRux)2As2 and Ba(Fe1-xCox)2As2: possible changes of Fermi surface with and without changes in electron count
• Magnetic moment evolution and spin freezing in doped BaFe${}_2$As${}_2$
• Annealing effects on superconductivity in SrFe2-xNixAs2
• Measurements of the fluctuation-induced in-plane magnetoconductivity at high reduced temperatures and magnetic fields in the iron arsenide BaFe(2-x)NixAs2
• Suppression of magnetic order in CaCo${}_{1.86}$As${}_2$ with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co${}_{1-x}$Fe${}_x$)${}_y$As${}_2$
• Experimental elucidation of the origin of the `double spin resonances' in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Phase Competition and Anomalous Thermal Evolution in High-Temperature Superconductors
• Effect of heavy-ion irradiation on London penetration depth in over-doped Ba(Fe,Co)2As2
• Nematicity in the superconducting mixed state of strain detwinned underdoped $\text{Ba}({\text{Fe}}_{1-x}{\text{Co}}_x{)}_2{\text{As}}_2$
• Universal Scaling Law for the Condensation Energy, U, Across a Broad Range of Superconductor Classes
• Spin dynamics near a putative antiferromagnetic quantum critical point in Cu substituted BaFe${}_2$As${}_2$ and its relation to high-temperature superconductivity
• The interplay between magnetism, structure, and strong electron-phonon coupling in binary FeAs under pressure
• Antiferromagnetic order in Ca${}_{10}$(Pt${}_3$As${}_8$)(Fe${}_2$As${}_2$)${}_5$ observed by ${}^{75}$As NMR
• Importance of Fermi Surface Topology for In-Plane Resistivity Anisotropy in Hole- and Electron-Doped Ba(Fe${}_{1-x}$TM${}_x$)${}_2$As${}_2$ (TM=Cr, Mn and Co)
• Elastoresistive and Elastocaloric Anomalies at Magnetic and Electronic-Nematic Critical Points
• Superconductivity with the enhanced upper critical field in the Pt-Doping CuRh2Se4 spinel
• Brief review on iron-based superconductors: are there clues for unconventional superconductivity?
• Large single crystal growth of BaFe1.87Co0.13As2 using a nucleation pole
• Memory matrix theory of the dc resistivity of a disordered antiferromagnetic metal with an effective composite operator
• Combined effects of transition metal (Ni and Rh) substitution and annealing/quenching on physical properties of CaFe${}_2$As${}_2$
• Effect of proton irradiation on the normal state low-energy excitations of Ba(Fe${}_{1-x}$Rh${}_x$)${}_2$As${}_2$ superconductors
• Pressure-induced superconductivity in palladium sulfide
• NMR investigation of vortex dynamics in Ba(Fe0.93Rh0.07)2As2 superconductor
• The influence of spin fluctuations on the thermal conductivity in superconducting Ba(Fe_{1-x}Co_x)_2As_2
• Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Trapping Majorana Zero Modes in Vortices of Magnetic Texture Crystals Coupled to Nodal Superconductors
• Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors
• Persistence of slow fluctuations in the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors
• Point Contact Spectroscopy of Fe Pnictides & Chalcogenides In The Normal State
• Upper Critical Field of Sr${}_2$RuO${}_4$ under In-Plane Uniaxial Pressure
• Mechanisms for Magnetic Skyrmion Catalysis and Topological Superconductivity
• Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr${}_{0.67}$Na${}_{0.33}$Fe${}_2$As${}_2$
• Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
• Fermi surfaces and Phase Stability of Ba(Fe${}_{1-x}$M${}_x$)${}_2$As${}_2$ (M=Co, Ni, Cu, Zn)
• Magnetically polarized Ir dopant atoms in superconducting Ba(Fe${}_{1-x}$Ir${}_x$)${}_2$As${}_2$
• Agreement between local and global measurements of the London penetration depth
• Competing superconducting and magnetic order parameters and field-induced magnetism in electron doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Transport properties of ultrathin BaFe1.84Co0.16As2 superconducting nanowires
• Monoclinic LaSb${}_2$ Superconducting Thin Films
• Carrier localization due to local magnetic order induced by magnetic impurities in Ba(Fe${}_{1-x}$TM${}_x$)${}_2$As${}_2$ (TM = Mn and Cr) as seen via optical spectra
• Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal
• Non-contact mutual inductance based measurement of an inhomogeneous topological insulating state in Bi2Se3 single crystals with defects
• Upper Critical Fields and Anisotropy of Ca1-xLaxFe2As2 Single Crystals
• Theoretical investigation of the electronic and magnetic properties of the orthorhombic phase of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Role of Fermi surface for the pressure-tuned nematic transition in the BaFe${}_2$As${}_2$ family
• The interplay of electron doping and chemical pressure in Ba(Fe(1-y)Coy)2(As(1-x)Px)2
• Electronic origin of structural transition in 122 Fe based superconductors
• Nodeless superconductivity in the charge density wave superconductor LaPt${}_2$Si${}_2$
• Random matrix models for phase diagrams
• Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors
• Spin polarization of Ru in superconducting Ba(Fe${}_{0.795}$Ru${}_{0.205}$)${}_2$As${}_2$ studied by x-ray resonant magnetic scattering
• Vibrational anomalies in AFe${}_2$As${}_2$ (A$=$Ca, Sr, and Ba) single crystals
• Anisotropic optical properties of detwinned BaFe${}_2$As${}_2$
• Disappearance and Survival of Superconductivity in FeSe under High Pressure
• Evolution of shape and volume fraction of superconducting domains with temperature and anion disorder in (TMTSF)${}_2$ClO${}_4$
• Superconductivity-induced transverse plasma mode and phonon anomaly in the $c$-axis response of the bilayer compound RbCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Calculation of the magnetotransport for a spin-density-wave quantum critical theory in the presence of weak disorder
• Measurements of elastoresistance under pressure by combining in-situ tunable quasi-uniaxial stress with hydrostatic pressure
• High-Pressure Evolution of the Specific Heat of a Strongly Underdoped Ba(Fe0.963Co0.037)As2 Iron-Based Superconductor
• Pressure tuned superconductivity and normal state behavior in Ba(Fe${}_{0.943}$Co${}_{0.057}$)${}_2$As${}_2$ near the antiferromagnetic boundary
• Gap-like feature in the normal state of $\mathbf{X}(\mathbf{F}{\mathbf{e}}_{1-\mathbf{x}}\mathbf{C}{\mathbf{o}}_{\mathbf{x}}{)}_2\mathbf{A}{\mathbf{s}}_2$, $\mathbf{X}=\mathbf{Ba},\mathbf{Sr}$ and $\mathbf{F}{\mathbf{e}}_{1+\mathbf{y}}\mathbf{Te}$ revealed by Point Contact Spectroscopy
• Evolution of superconductivity and antiferromagnetic order in Ba(Fe${}_{0.92-x}$Co${}_{0.08}$V${}_x$)${}_2$As${}_2$
• 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
• Superconductivity In K- And Na- Doped Bafe2as2: What Can We Learn From Heat Capacity And Pressure Dependence of Tc
• Large increase of the anisotropy factor in the overdoped region of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ as probed by fluctuation spectroscopy
• Metallicity of Ca2Cu6P5 with Single and Double Copper-Pnictide Layers
• Lack of superconductivity in the phase diagram of single-crystalline Eu(Fe1-xCox)2As2 grown by transition metal arsenide flux
• Intrinsic superconducting properties and vortex dynamics in heavily overdoped Ba(Fe${}_{0.86}$Co${}_{0.14}$)${}_2$As${}_2$ single crystal
• Coupled Magnetic and Superconducting Transitions in Sr${}_2$VO${}_3$FeAs Under Pressure
• Design and Predict Tetragonal van der Waals Layered Quantum Materials of MPd${}_5$I${}_2$ (M=Ga, In and 3$d$ Transition Metals)
• Persistent Magnetism in Silver-doped BaFe2As2 Crystals
• Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Synthesis and physical properties of the new potassium iron selenide superconductor K0.80Fe1.76Se2
• Superconductivity Near a Quantum Critical Point in Ba(Fe,Co)2As2
• Low-energy, planar magnetic defects in BaFe2As2: nanotwins, twins, antiphase and domain boundaries
• Structural and antiferromagnetic properties of Ba(Fe${}_{1-x-y}$Co${}_x$Rh${}_y$)${}_2$As${}_2$ compounds
• Phase diagram of the NdFe1-xRhxAsO superconductor
• Effect of equatorial line nodes on upper critical field and London penetration depth
• Magnetotransport studies of optimally doped Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Local magnetic inhomogeneities observed via 75As NMR in Ba(Fe1-xNix)2As2 with H0 {\perp} c-axis
• Relationship between critical current and flux-flow resistivity in the mixed state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Penetration of the magnetic field into the twinning plane in the type I and II superconductors
• Evidence of diamagnetic fluctuations above Tc in BaFe2-xCoxAs2 single crystals
• New mechanisms to engineer magnetic skyrmions and topological superconductors
• Signature of Unconventional Superconductivity in the High Temperature Normal State Resistivity
• The hybrid lattice of KxFe2-ySe2: why superconductivity and magnetism can coexist