The magnetic susceptibility of cupric oxide

O’Keeffe, Michael; Stone, F. S.

doi:10.1016/0022-3697(62)90010-0

Cited by 175 publications

(87 citation statements)

References 18 publications

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“…2,3,5 Between T N1 and T N2 , the magnetic structure is incommensurate with different propagation vectors reported by different authors, as summarized by Aïn et al 5 Nevertheless, all authors report only small incommensurability in this phase; e.g., Forsyth et al observed a propagation vector of (0.506 0 −0.483). 2 The magnetic susceptibility measurement reported by O'Keeffe et al 1 and then confirmed more recently by Köbler et al…”

Section: Introductionmentioning

confidence: 79%

“…[14][15][16] However, Table II also shows that the in-plane and interplane interactions appear at equal strength, suggesting that CuO does not really belong to the onedimensional antiferromagnetic compounds, which disagrees with experimental findings. 1,11 We shall see that this is due to the use of a spin-unrestricted approach at the Hartree-Fock level. Semiempirical approaches to the DFT calculations, either by introducing an effective internal energy U to the LDA Hamiltonian or mixing LDA and exact Hartree-Fock exchange functionals, can recover coupling constants which are in a good agreement with experiment.…”

Section: Resultsmentioning

confidence: 99%

“…The main motivation for early studies on CuO was that part of the physics of high-T c superconductors can be explained by studying this compound. Cupric oxide itself exhibits unusual magnetic properties, [1][2][3][4][5] which deserve detailed study. Furthermore, it was observed more recently that in cupric oxide a magnetoelectric coupling occurs at its incommensurate antiferromagnetic phase, which exists in a temperature range of 212-230 K. 2,3,5 This suggests that CuO is an interesting candidate in the search for high-temperature magnetoelectric multiferroics.…”

Section: Introductionmentioning

confidence: 99%

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First-principles study of magnetic interactions in cupric oxide

et al. 2012

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International audienceCupric oxide (CuO) has been described as belonging to the quasi-one-dimensional antiferromagnetic compounds. It has also been suggested that cupric oxide possesses strong magnetic anisotropy, which is possibly related to the observed ferroelectricity in this material. In this paper, the magnetic interactions of CuO are investigated using the embedded cluster approach. Accurate wave-function-based methods have been employed to describe the interactions along all copper-oxygen chain directions. Both two-center and three-center clusters are considered in our calculations. The antisymmetric anisotropic interaction parameters are also calculated for the two-center clusters by applying an effective Hamiltonian theory. Our results show that the magnetic interactions are dominated by the antiferromagnetic coupling between copper ions along the chain of largest Cu-O-Cu angles in agreement with experiment. The results for the interplane magnetic interactions reveal competition between nearest-neighbor ferromagnetic coupling and second-nearest-neighbor antiferromagnetic interaction along the direction where two copper ions are connected via doubly bridged oxygen ligands. We also find nonnegligible Dzyaloshinskii-Moriya interactions with magnitude comparable to the weak isotropic interchain interactions

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Section: Introductionmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First-principles study of magnetic interactions in cupric oxide

et al. 2012

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“…It can be seen that hysteresis is present even at temperatures above the Néel temperature in CuO nanoparticles, which is quite unusual, and the origin of this is most likely the low dimensionality of CuO and a short range magnetic order which is present above the Néel temperature. [20,[22][23][24] The fact that this short range order does not lead to any hysteresis in the bulk material means that it is antiferromagnetic in nature. This short range antiferromagnetic order gives rise to a weak ferromagnetism in the nanoparticles, which in turn causes the observed hysteresis even at room temperature, by the mechanism suggested by Néel.…”

Section: Hysteresis Measurementsmentioning

confidence: 99%

“…It has been known experimentally by neutron scattering, specific heat and magnetic susceptibility studies that CuO undergoes a transition to an incommensurate antiferromagnetic state at its Néel temperature 230 K followed by a transition from the incommensurate to a commensurate antiferromagnetic state at 213 K. [20][21][22] However, strangely, the magnetic susceptibility of CuO instead of peaking at its Néel temperature undergoes a change in slope there and shows a broad maximum at about 540 K. [23] This behavior has been claimed by many authors as a manifestation of its quasi one dimensional nature and the related presence of some sort of short range order above the Néel temperature. [20,22,24] There have been claims that CuO can be visualized to have a spin fluid state above the Néel temperature where the spins are thought to be dynamically correlated over several lattice spacings.…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetic behavior of CuO nanoparticles

Bisht

Rajeev

Banerjee

2010

Solid State Communications

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We report studies on temperature, field and time dependence of magnetization on cupric oxide nanoparticles of sizes 9 nm, 13 nm and 16 nm. The nanoparticles show unusual features in comparison to other antiferromagnetic nanoparticle systems. The field cooled (FC) and zero field cooled (ZFC) magnetization curves bifurcate well above the Néel temperature and the usual peak in the ZFC magnetization curve is absent. The system does not show any memory effects which is in sharp contrast to the usual behavior shown by other antiferromagnetic nanoparticles. It turns out that the non-equilibrium behavior of CuO nanoparticles is very strange and is neither superparamagnetic nor spin glass-like.

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Photoelectrochemical Water‐Splitting Using CuO‐Based Electrodes for Hydrogen Production: A Review

et al. 2021

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The cost‐effective, robust, and efficient electrocatalysts for photoelectrochemical (PEC) water‐splitting has been extensively studied over the past decade to address a solution for the energy crisis. The interesting physicochemical properties of CuO have introduced this promising photocathodic material among the few photocatalysts with a narrow bandgap. This photocatalyst has a high activity for the PEC hydrogen evolution reaction (HER) under simulated sunlight irradiation. Here, the recent advancements of CuO‐based photoelectrodes, including undoped CuO, doped CuO, and CuO composites, in the PEC water‐splitting field, are comprehensively studied. Moreover, the synthesis methods, characterization, and fundamental factors of each classification are discussed in detail. Apart from the exclusive characteristics of CuO‐based photoelectrodes, the PEC properties of CuO/2D materials, as groups of the growing nanocomposites in photocurrent‐generating devices, are discussed in separate sections. Regarding the particular attention paid to the CuO heterostructure photocathodes, the PEC water splitting application is reviewed and the properties of each group such as electronic structures, defects, bandgap, and hierarchical structures are critically assessed.

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The magnetic susceptibility of cupric oxide

Cited by 175 publications

References 18 publications

First-principles study of magnetic interactions in cupric oxide

First-principles study of magnetic interactions in cupric oxide

Anomalous magnetic behavior of CuO nanoparticles

Photoelectrochemical Water‐Splitting Using CuO‐Based Electrodes for Hydrogen Production: A Review

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