Crystal and Magnetic Structure of CaCo{1.86}As2 Studied by X-ray and Neutron Diffraction

Abstract

Neutron and x-ray diffraction measurements are presented for powders and single crystals of CaCo{1.86}As2. The crystal structure is a collapsed-tetragonal ThCr2Si2-type structure as previously reported, but with 7(1)% vacancies on the Co sites corresponding to the composition CaCo{1.86(2)}As2. The thermal expansion coefficients for both the a- and c-axes are positive from 10 to 300 K. Neutron diffraction measurements on single crystals demonstrate the onset of A-type collinear antiferromagnetic order below the Neel temperature TN = 52(1) K with the ordered moments directed along the tetragonal c-axis, aligned ferromagnetically in the ab-plane and antiferromagnetically stacked along the c-axis.

8 pages, 5 figures, 2 tables; submitted to Phys. Rev. B

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Cited by in corpus (35)

• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Physical Properties of Metallic Antiferromagnetic CaCo{1.86}As2 Single Crystals
• Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
• Frustrated magnetism in tetragonal CoSe, analogue to superconducting FeSe
• Effective One-Dimensional Coupling in the Highly-Frustrated Square-Lattice Itinerant Magnet CaCo${}_{2-y}$As${}_2$
• Interfacial crystal Hall effect reversible by ferroelectric polarization
• Coexistence of ferromagnetic and stripe antiferromagnetic spin fluctuations in SrCo${}_2$As${}_2$
• Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals
• Crystallography and Physical Properties of BaCo2As2, Ba{0.94}K{0.06}Co2As2 and Ba{0.78}K{0.22}Co2As2
• Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo{2-y}As2
• Spin-flop transition and magnetic phase diagram in CaCo${}_2$As${}_2$ revealed by torque measurements
• Electronic structure and spin dynamics of ACo2As2 (A=Ba, Sr, Ca)
• Structure and magnetic properties of {\it Ln}MnSbO ({\it Ln} = La and Ce) and CeMnAsO
• Pressure-induced collapsed-tetragonal phase in SrCo2As2
• Ferromagnetic cluster-glass phase in Ca(Co,Ir)2As2 crystals
• Tunable Cobalt Vacancies and Related Properties in LaCoxAs2
• Itinerant G-type antiferromagnetic order in SrCr${}_2$As${}_2$
• Flat band magnetism and helical magnetic order in Ni-doped SrCo${}_2$As${}_2$
• Competing magnetic phases and itinerant magnetic frustration in SrCo${}_2$As${}_2$
• Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet Ca{1-x}Sr{x}Co{2-y}As{2}
• Intertwined magnetic and nematic orders in semiconducting KFe${}_{0.8}$Ag${}_{1.2}$Te${}_2$
• Helical magnetic ordering in Sr(Co1-xNix)2As2
• Flatband-Induced Itinerant Ferromagnetism in RbCo${}_2$Se${}_2$
• 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${}_2$
• Antiferromagnetic Stacking of Ferromagnetic Layers and Doping Controlled Phase Competition in Ca${}_{1-x}$Sr${}_x$Co${}_{2-y}$As${}_2$
• Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)2As2 revealed by 75As nuclear magnetic resonance
• Influence of the surface symmetry breaking on the magnetism, collapsing and three dimensional dispersion of Co pnictides ACo2As2 (A=Ba, Sr, Ca)
• Observation of a C-type short range antiferromagnetic order in expanded FeS
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Competing magnetic fluctuations and orders in a multiorbital model of doped SrCo${}_2$As${}_2$
• Carrier Tuning of Stoner Ferromagnetism in ThCr${}_2$Si${}_2$-Structure Cobalt Arsenides
• Suppression of antiferromagnetic order and strong ferromagnetic spin fluctuations in Ni-doped CaCo2As2 single crystals
• Magnetic order and fluctuations in quasi-two-dimensional planar magnet Sr(Co${}_{1-x}$Ni${}_x$)${}_2$As${}_2$
• Spin dynamics in itinerant antiferromagnet SrCr${}_2$As${}_2$
• Europium $c$-axis ferromagnetism in Eu(Co${}_{1-x}$Ni${}_x$)${}_{2-y}$As${}_2$: A single-crystal neutron diffraction study