Oxygen Moment Formation and Canting in Li2CuO2
E.M.L.Chung, G.J.McIntyre, D.McK.Paul, G.Balakrishnan, M.R.Lees
TL;DR
This study reveals that oxygen moments and canting are significant in Li2CuO2, with neutron diffraction showing large oxygen moments and a canted magnetic structure at low temperature.
Contribution
It introduces the first detailed analysis of oxygen moment formation and canting in Li2CuO2 using neutron diffraction and spin-density analysis.
Findings
Oxygen moments of 0.11 μB are present in Li2CuO2.
Magnetization densities are highly aspherical, forming quasi-1D ribbons.
Evidence suggests the magnetic structure is canted at 2 K.
Abstract
The possibilities of oxygen moment formation and canting in the quasi-1D cuprate Li2CuO2 are investigated using single crystal neutron diffraction at 2 K. The observed magnetic intensities could not be explained without the inclusion of a large ordered oxygen moment of 0.11(1) Bohr magnetons. Least-squares refinement of the magnetic structure of Li2CuO2 in combination with a spin-density Patterson analysis shows that the magnetization densities of the Cu and O atoms are highly aspherical, forming quasi-1D ribbons of localised Cu and O moments. Magnetic structure refinements and low-field magnetization measurements both suggest that the magnetic structure of Li2CuO2 at 2 K may be canted. A possible model for the canted configuration is proposed.
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