Electronic structure and lattice dynamics of domeykite Cu3As according to nuclear quadrupolar resonance of75As and63,65Cu

Begaev, B. B.; Dooglav, A. V.; Kal’chev, V. P.; Krjukov, E. V.; Mukhamedshin, I. R.; Pen’kov, I. N.

doi:10.1007/bf03166134

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Three binary phases exist in the Cu-As binary phase diagram with compositions of approximately Cu 3 As, Cu 5 As 2 and Cu 2 As. Previous ρ, χ and nuclear quadrupole resonance measurements versus T on these phases 31,32 showed no phase transitions at any temperature near our phase transition temperature T t = 54-56 K. Moreover, the SrCu 2 As 2 crystals for which we reported the properties in Ref. 16 were grown using the same CuAs self-flux, and these crystals showed no evidence for a transition at T ≈ 55 K in our ρ(T ) measurements on them.…”

Section: Electrical Resistivitysupporting

confidence: 52%

Observation of a phase transition at 55 K in single-crystal CaCu1.7As2

Anand

Johnston

2012

Phys. Rev. B

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We present the structural, magnetic, thermal and ab-plane electronic transport properties of single crystals of CaCu1.7As2 grown by the self-flux technique that were investigated by powder x-ray diffraction, magnetic susceptibility χ, isothermal magnetization M , specific heat Cp, and electrical resistivity ρ measurements as a function of temperature T and magnetic field H. X-ray diffraction analysis of crushed crystals at room temperature confirm the collapsed tetragonal ThCr2Si2-type structure with ∼ 15% vacancies on the Cu sites as previously reported, corresponding to the composition CaCu1.7As2. The χ(T ) data are diamagnetic, anisotropic and nearly independent of T . The χ is larger in the ab-plane than along the c-axis, as also observed previously for SrCu2As2 and for pure and doped BaFe2As2. The Cp(T ) and ρ(T ) data indicate metallic sp-band character. In contrast to the χ(T ) and Cp(T ) data that do not show any evidence for phase transitions below 300 K, the ρ(T ) data exhibit a sharp decrease on cooling below a temperature Tt = 54-56 K, depending on the crystal. The ρ(T ) data show no hysteresis on warming and cooling through Tt and the transition thus appears to be second order. The phase transition may arise from spatial ordering of the vacancies on the Cu sublattice. The Tt is found to be independent of H for H ≤ 8 T. A positive magnetoresistance is observed below Tt that increases with decreasing T and attains a value in H = 8.0 T of 8.7% at T = 1.8 K.

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Section: Electrical Resistivitysupporting

confidence: 52%

Observation of a phase transition at 55 K in single-crystal CaCu1.7As2

Anand

Johnston

2012

Phys. Rev. B

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“…The resistivity data for each sample shown in Fig. 9 also show a kink near 220 K. This feature is likely caused by the impurity phase Cu 3 As which is known to have a resistivity anomaly near 220K [38][39] .…”

Section: B Co-doped Cu X Fe 1+y Asmentioning

confidence: 85%

Weak ferromagnetism ofCuxFe1+yAsand its evolution with Co doping

Qian

Han

et al. 2015

Phys. Rev. B

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We have investigated electronic and magnetic properties of iron pnictide Cu x Fe 1+y As, which is isostructural to iron pnictide superconductors LiFeAs and NaFeAs, using polycrystalline and single crystal samples. We found that Cu x Fe 1+y As is characterized by strong electron correlations and shows weak ferromagnetic behavior with the Curie temperature T c ~ 42 K, in contrast with the superconductivity in LiFeAs and NaFeAs. Its electronic transport properties exhibit quasi-two-dimensional characteristics: while the in-plane resistivity follows quadratic temperature dependence for T < 10K, the c-axis resistivity shows nonmetal-to-metal crossover near 20 K. In addition, we have studied Co doping effect on Cu x Fe 1+y As and found that Co doping enhances the ferromagnetism with T c increasing up to 83 K for Cu x Fe 0.5 Co 0.5 As. From these results, we discussed the origin of the ferromagnetism of Cu x Fe 1+y As and its relevance with the magnetism of iron pnictide superconductor parent compounds 2

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“…The relatively large amount of data for the binary As(Sb)S(Se) compounds and their polymorphs are summarised in [6]. NQR frequencies have been reported for several arsenic minerals such as domeykite (Cu 3 As) [8], orpiment (As 2 S 3 ) [9], proustite (Ag 3 AsS 3 ) [4], realgar As 4 S 4 [3], and tennantite (Cu 12 As 4 S 13 ) [10].…”

mentioning

confidence: 99%