Control of magnetic, non-magnetic and superconducting states in annealed Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

We have grown single crystal samples of Co substituted CaFe2As2 using an FeAs flux and systematically studied the effects of annealing/quenching temperature on the physical properties of these samples. Whereas the as-grown samples (quenched from 960C) all enter the collapsed tetragonal phase upon cooling, annealing/quenching temperatures between 350C and 800C can be used to tune the system to low temperature antiferromagnetic/orthorhomic or superconducting states as well. The progression of the transition temperature versus annealing/quenching temperature (T-T${}_{anneal}$) phase diagrams with increasing Co concentration shows that, by substituting Co, the antiferromagnetic/orthorhombic and the collapsed tetragonal phase lines are separated and bulk superconductivity is revealed. We established a 3D phase diagram with Co concentration and annealing/quenching temperature as two independent control parameters. At ambient pressure, for modest x and T${}_{anneal}$ values, the Ca(Fe1-xCox)2As2 system offers ready access to the salient low temperature states associated with Fe-based superconductors: antiferromagnetic/orthorhombic, superconducting, and non-magnetic/collapsed tetragonal.

38pages, 21figures

References in corpus (22)

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• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• 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
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• First order structural phase transition in CaFe${}_2$As${}_2$
• Superconductivity induced by Ni doping in BaFe${}_2$As${}_2$
• Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$
• Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals
• The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
• Structural transition and anisotropic properties of single crystalline SrFe2As2
• Lattice collapse and quenching of magnetism in CaFe2As2 under pressure: A single crystal neutron and x-ray diffraction investigation
• Pressure-induced superconductivity in single crystal CaFe2As2
• Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2
• Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals
• Presure-Induced Superconducting State of Antiferromagnetic CaFe${}_2$As${}_2$
• Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2
• Specific Heat Discontinuity, deltaC, at Tc in BaFe2(As0.7P0.3)2 - Consistent with Unconventional Superconductivity
• Tricritical Phenomena at the Cerium $\gamma \to \alpha$ Transition

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• Optimization of the Crystal Growth of the Superconductor CaKFe${}_4$As${}_4$ from Solution in the FeAs-CaFe${}_2$As${}_2$-KFe${}_2$As${}_2$ System
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• Pressure induced half-collapsed-tetragonal phase in CaKFe${}_4$As${}_4$
• Dramatic Changes in the Electronic Structure Upon Transition to the Collapsed Tetragonal Phase in CaFe2As2
• Hydrostatic-pressure tuning of magnetic, nonmagnetic and superconducting states in annealed Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Upper critical field of KFe2As2 under pressure: A test for the change in the superconducting gap structure
• Complex structures of different CaFe${}_2$As${}_2$ samples
• Superelasticity and Cryogenic Linear Shape Memory Effects of CaFe2As2
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Antiferromagnetic order in CaK(Fe[1-x]Ni[x])4As4 and its interplay with superconductivity
• Preserved entropy and fragile magnetism
• The suppression of electron correlations in the collapsed tetragonal phase of CaFe2As2 under ambient pressure demonstrated by 75As NMR-NQR measurements
• Effect of biaxial strain on the phase transitions of Ca(Fe1-xCox)2As2
• Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals
• Spin-density-wave-induced anomalies in the optical conductivity of AFe2As2, (A=Ca, Sr, Ba) single-crystalline iron pnictides
• Coexistence of two superconducting phases in Ca1-xLaxFe2As2
• Volovik Effect and Fermi-Liquid Behavior in the s-Wave Superconductor CaPd2As2: 75As NMR-NQR Measurements
• Transition to collapsed tetragonal phase in CaFe2As2 single crystals as seen by 57Fe Mossbauer spectroscopy
• Ab-initio perspective on structural and electronic properties of iron-based superconductors
• Antiferromagnetic spin correlations and pseudogap-like behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity
• Thermal expansion of CaFe2As2: effect of cobalt doping and post-growth thermal treatment
• Collapsed Tetragonal Phase Transition in LaRu${}_2$P${}_2$
• Direct visualization of phase separation between superconducting and nematic domains in Co-doped CaFe2As2 close to a first order phase transition
• Observation of Two Collapsed Phases in CaRbFe4As4
• Separation of antiferromagnetism and high-temperature superconductivity in Ca${}_{1-x}$La${}_x$Fe${}_2$As${}_2$ under pressure
• 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${}_2$
• Electronic Phase Diagram of SrFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Effect of Structural Dimensionality
• Unusual Sensitivity of Superconductivity to Strain in Iron-Based 122 Superconductors
• Combined effects of transition metal (Ni and Rh) substitution and annealing/quenching on physical properties of CaFe${}_2$As${}_2$
• Pressure-temperature phase diagram of EuRbFe${}_4$As${}_4$ superconductor
• Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)2As2 revealed by 75As nuclear magnetic resonance
• Effects of post-annealing and cobalt co-doping on superconducting properties of (Ca,Pr)Fe2As2 single crystals
• Reversible Tuning of the Collapsed Tetragonal Phase Transition in CaFe2As2 by Separate Control of Chemical Pressure and Electron Doping
• Miscibility gap and possible intrinsic Griffiths phase in Sr(Fe1-xMnx)2As2 crystals grown by transitional metal arsenide flux
• Combined effects of Sr substitution and pressure on the ground states in CaFe${}_2$As${}_2$
• Lack of superconductivity in the phase diagram of single-crystalline Eu(Fe1-xCox)2As2 grown by transition metal arsenide flux
• Signature of Unconventional Superconductivity in the High Temperature Normal State Resistivity