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

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

2008-07-29

arxiv.org/abs/0807.4651v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.78.104409

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.

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