Crystal Growth and Physical Properties of SrCu2As2, SrCu2Sb2 and BaCu2Sb2

Abstract

We report the growth of single crystals of SrCu2As2, SrCu2Sb2, SrCu2(As{0.84}Sb{0.16})2 and BaCu2Sb2 using the self-flux technique and their structural, magnetic, thermal and transport properties that were investigated by powder x-ray diffraction (XRD), magnetic susceptibility chi, specific heat Cp and electrical resistivity rho measurements versus temperature T from 1.8 to 350 K. Rietveld refinements of XRD patterns for crushed crystals confirm that SrCu2As2 crystallizes in the ThCr2Si2-type structure and SrCu2Sb2 crystallizes in the CaBe2Ge2-type structure. However, BaCu2Sb2 is found to have a large unit cell consisting of three blocks. Here a ThCr2Si2-type block is sandwiched between two CaBe2Ge2-type blocks along the c-axis, as reported, but likely with a monoclinic distortion. The chi data of all these compounds are diamagnetic and reveal nearly T-independent anisotropic behavior. The finite values of the Sommerfeld linear specific heat coefficients gamma and the T dependences of rho reveal metallic character of all four compounds. The electronic and magnetic properties indicate that these compounds are sp metals with Cu in the 3d^{10} electronic configuration corresponding to the oxidation state Cu^{+1}, as previously predicted theoretically for (Sr,Ba)Cu2As2 by D. J. Singh. We find that SrCu2As2 has a collapsed-tetragonal structure. The electronic character of the Cu and the strength of the As-As interlayer bonding are both expected to drastically change between weakly Cu-substituted BaFe2As and pure BaCu2As2.

26 pages, 23 figures, 8 tables, 105 references; v2: substantially expanded the discussion about collapsed tetragonal phases and transition metal doping of BaFe2As2. Submitted to PRB

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• Do Transition Metal Substitutions Dope Carriers in Iron Based Superconductors?
• Hole and Electron Contributions to the Transport Properties of Ba(Fe_(1-x)Ru_x)_2As_2 Single Crystals
• Structural, Thermal, Magnetic and Electronic Transport Properties of the LaNi2(Ge{1-x}P{x})2 System
• Superconductivity and the Effects of Pressure and Structure in Single Crystalline SrNi${}_2$P${}_2$
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• What controls the phase diagram and superconductivity in Ru substituted BaFe${}_2$As${}_2$?
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• Structural Phase Transitions in SrRh2As2
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Cited by in corpus (40)

• Crystallographic, Electronic, Thermal and Magnetic Properties of Single-Crystal SrCo2As2
• Superconducting and Normal State Properties of APd2As2 (A = Ca, Sr, Ba) Single Crystals
• Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR study
• Crystal and Magnetic Structure of CaCo{1.86}As2 Studied by X-ray and Neutron Diffraction
• Antiferromagnetism in EuCu2As2 and EuCu1.82Sb2 Single Crystals
• Electronic properties of 3d transitional metal pnictides : A comparative study by optical spectroscopy
• A Mott insulator continuously connected to iron pnictide superconductors
• Physical Properties of Metallic Antiferromagnetic CaCo{1.86}As2 Single Crystals
• Phase diagram and physical properties of NaFe${}_{1-x}$Cu${}_x$As single crystals
• EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet
• Narrow Bandgap in beta-BaZn2As2 and Its Chemical Origins
• Non-Fermi-liquid behaviors associated with a magnetic quantum-critical point in Sr(Co{1-x}Ni{x})2As2 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
• Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2
• Helical Antiferromagnetic Ordering in EuNi{1.95}As2
• Physical properties of EuPd2As2 single crystals
• Impact of local-moment fluctuations on the magnetic degeneracy of iron arsenide superconductors
• Ferromagnetic cluster-glass phase in Ca(Co,Ir)2As2 crystals
• Pressure-induced collapsed-tetragonal phase in SrCo2As2
• Direct spectroscopic evidence for completely filled Cu $3d$ shell in BaCu${}_2$As${}_2$ and $\alpha$-BaCu${}_2$Sb${}_2$
• Magnetism and superconductivity in the layered hexagonal transition metal pnictides
• Superconductivity and Physical Properties of CaPd2Ge2 Single Crystals
• Magnetic phase transitions in Eu(Co,Ni)2As2 single crystals
• Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet Ca{1-x}Sr{x}Co{2-y}As{2}
• Kondo effect in a novel 5d quasi-skutterudite Yb3Os4Ge13
• Observation of a Phase Transition at 55 K in Single-Crystal CaCu1.7As2
• Localization and Orbital Selectivity in Iron-Based Superconductors with Cu Substitution
• 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 structure of BaNi${}_2$P${}_2$ observed by angle-resolved photoemission spectroscopy
• Phase diagram and neutron spin resonance of superconducting NaFe${}_{1-x}$Cu${}_x$As
• Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$
• Observation of charge accumulation and onsite Coulomb repulsion at transition metal impurities in the iron pnictides
• Spin correlation in trigonal EuMn${}_2$As${}_2$
• Magnetic Properties of RFe2Si2 and R(Fe1-xMx)2Si2 Systems (R=La, Y and Lu, M= Ni, Mn and Cu)
• Novel polymorphic phase of BaCu2As2: impact of flux for new phase formation in crystal growth
• Cu doping effects on the electronic structure of Fe1-xCuxSe
• Spin dynamics in NaFeAs and NaFe${}_{0.53}$Cu${}_{0.47}$As probed by resonant inelastic X-ray scattering
• Carrier Tuning of Stoner Ferromagnetism in ThCr${}_2$Si${}_2$-Structure Cobalt Arsenides
• Absence of itinerant ferromagnetism in a cobalt-based oxypnictide