SUGIYAMA, Jun; IKEDO, Yutaka; NOZAKI, Hiroshi; MUKAI, Kazuhiko; ANDREICA, Daniel; AMATO, Alex; MÉNÉTRIER, Michel; CARLIER-LARREGARAY, Dany; DELMAS, Claude

doi:10.1016/j.physb.2008.11.177

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SUGIYAMA, Jun
Central Research and Development Laboratory

IKEDO, Yutaka
Central Research and Development Laboratory

NOZAKI, Hiroshi
Central Research and Development Laboratory

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Physica B: Condensed Matter. 2009, vol. 404, n° 5-7, p. 769-772

Elsevier

Résumé en anglais

In order to elucidate the origin of antiferromagnetic (AF) order below 30 K in LiCoO2, in which all the Co3+ ions are in a low-spin state with S=0, the magnetic nature of the Li-excess sample Li1.04Co0.96O1.96 was studied by muon-spin spectroscopy in the temperature range between 1.8 and 100 K. Although disordered localized moments appeared below 25 K, static AF order was not detected even at 1.8 K. Moreover, a small amount of excess Li ions (4%) and oxygen vacancies (2%) was found to change not, vert, similar50% of the sample into a magnetically disordered phase at 1.8 K. The stoichiometric LiCoO2, which was prepared from the same starting materials to those for the Li-excess sample, showed an AF transition at 30 K, while the volume fraction of the AF phase was 10% even at 1.8 K. This therefore excludes the possible role of the excess Li+ on the formation of static AF order.< Réduire

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Antiferromagnetic order

LiCoO<sub>2</sub>

Triangular lattice

Oxygen vacancies

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Annihilation of antiferromagnetic order in LiCoO<sub>2</sub> by excess Li

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