Effect of magnesium doping on the orbital and magnetic order in LiNiO2

In LiNiO2, the Ni3+ ions, with S=1/2 and twofold orbital degeneracy, are arranged on a trian- gular lattice. Using muon spin relaxation (MuSR) and electron spin resonance (ESR), we show that magnesium doping does not stabilize any magnetic or orbital order, despite the absence of interplane Ni2+. A...

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Bibliographic Details
Published in:arXiv.org 2008-07
Main Authors: Bonda, M, Hopzapfel, M, De Brion, Sophie, Darie, Céline, Feher, T, Baker, P J, Lancaster, T, Blundell, S J, Pratt, F L
Format: Article
Language:English
Subjects:
Anisotropy
Doping
Electron paramagnetic resonance
Electron spin
Electrons
Magnesium
Magnons
Muon spin relaxation
Occupancy
Orbital stability
Spin resonance
Variations
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Summary:In LiNiO2, the Ni3+ ions, with S=1/2 and twofold orbital degeneracy, are arranged on a trian- gular lattice. Using muon spin relaxation (MuSR) and electron spin resonance (ESR), we show that magnesium doping does not stabilize any magnetic or orbital order, despite the absence of interplane Ni2+. A disordered, slowly fluctuating state develops below 12 K. In addition, we find that magnons are excited on the time scale of the ESR experiment. At the same time, a g factor anisotropy is observed, in agreement with \(| 3z^{2}-r^{2}>\) orbital occupancy.
ISSN:2331-8422
DOI:10.48550/arxiv.0807.4651