Observation of Charge Stripes in Cupric Oxide

Abstract

One of the present intensive concerns about the high-temperature superconductors is whether charge stripes are a key to superconductivity. Here we report observation of charge stripes in the simplest copper oxide, CuO, by real-space images obtained by electron microscopy. Charge-ordered domains and normal-lattice domains exist alternatively in the vapor-grown single crystal of CuO. Since CuO consists of the Cu-O bonding, which is a basic material feature for high- T(c) cuprates, the discovery of charge stripes in this basic compound has important implications for discussing the mechanism of superconductivity in complex cuprates.

Atomic ordering of the fluorine dopant in theHgBa2CuO4+δhigh-TcCorreia1, Haas2, Amaral3 et al. 2005Phys. Rev. B81130View full textAdd to dashboardCite

“…When performing the first annealing step at 200°C under argon flow, the spectrum of Fig. 1͑a͒ shows a frequency triplet that reveals only one axially symmetric EFG 1 rameterized by italic values in Table I. The lower Q value could possibly be explained by an extra elongation of the average mercury-apical oxygen bond distance, d͓O͑2͒-Hg͔, upon fluorine doping, as observed in neutron diffraction data.…”

“…In fact, numerous and complex structural distortions as polaron deformations, as well as charge and spin stripes, strongly dependent on ionic doping, have been reported in the high-T c copper oxides. In this context, the findings of spin and charge inhomogeneities in the CuO bonds 1 and the CuO 2 ͑Ref. 2͒ layers in YBa 2 Cu 3 O 6+␦ have been related to lattice deformations.…”

Microemulsion Synthesis of Copper Oxide Nanorod-Like Structures

“…Cupric oxide, on the contrary, is monoclinic, ferroelectric [18] and recent studies seem to indicate it possesses at least three different magnetic polymorphs [23,24].…”

Investigation of the Multiferroic Transition in CuO Single Crystal using Dielectric and Raman Spectroscopy Measurements

“…There are four molecular units in the crystallographic unit cell but only two in the primitive cell. The lattice constants are a = 4.69 Å, b = 3.42 Å, c = 5.13 Å and β = 99.58° [7]. Correlating the site symmetries with the C 2h factor group theory, the normal modes Γ ≡ 4A u +5B u +A g +2B g of the zone center are obtained.…”

“…Zheng et al found hole ordering in striped domains analogous to the charge stripes in cuprates [7], and further found that there exists a strong charge-spin-lattice coupling and a possible Cu orbital coupling contributing to the short-range antiferromagnetic interaction up to 800 K, where a charge-spin-lattice correlated phase transition featured by charge excitation, specific heat anomaly and decrease in lattice distortion was verified [8]. They also observed ferroelectric properties in this strongly magnetic-dielectric coupled material [9].…”