Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2−δ

G J Shu; J C Tian; C K Lin; M Hayashi; S C Liou; W T Chen; Deniz P Wong; H L Liou; F C Chou

doi:10.1088/1367-2630/aa5af2

New Journal of Physics (Jan 2017)

Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2−δ

G J Shu,
J C Tian,
C K Lin,
M Hayashi,
S C Liou,
W T Chen,
Deniz P Wong,
H L Liou,
F C Chou

Affiliations

G J Shu: Center for Condensed Matter Sciences, National Taiwan University , Taipei 10617, Taiwan
J C Tian: Center for Condensed Matter Sciences, National Taiwan University , Taipei 10617, Taiwan; Department of Physics, National Taiwan Normal University , Taipei 11677, Taiwan
C K Lin: Center for Condensed Matter Sciences, National Taiwan University , Taipei 10617, Taiwan
M Hayashi: Center for Condensed Matter Sciences, National Taiwan University , Taipei 10617, Taiwan
S C Liou: Advanced Imaging and Microscopy (AIM) Lab, Nano Center, University of Maryland , College Park, MD 20742, United States of America
W T Chen: Center for Condensed Matter Sciences, National Taiwan University , Taipei 10617, Taiwan
Deniz P Wong: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
H L Liou: Department of Physics, National Taiwan Normal University , Taipei 11677, Taiwan
F C Chou: Center for Condensed Matter Sciences, National Taiwan University , Taipei 10617, Taiwan; National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan; Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10622, Taiwan

DOI: https://doi.org/10.1088/1367-2630/aa5af2
Journal volume & issue: Vol. 19, no. 2
p. 023026

Abstract

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Li _2 CuO _2 is a typical charge transfer insulator with CuO _2 chains that are composed of edge-shared CuO _4 plaquettes. The existence of oxygen vacancies for single crystals prepared under various oxygen partial pressures has been confirmed by the chemical and thermogravimetric analyses. The puzzling discovery of extra magnetic moment near the oxygen site by earlier neutron scattering studies has been verified by a thorough Curie–Weiss law analysis of spin susceptibilities, and resolved quantitatively with a molecular orbital model of edge-sharing CuO _2 chains containing oxygen vacancies.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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