NMR evidence for antiferromagnetic order in a planar 3d9/3d8 nickelate

Details NMR evidence for antiferromagnetic order in a planar 3d9/3d8 nickelate NMR evidence for antiferromagnetic order in a planar 3d9/3d8 nickelate

2010-05-04

arxiv.org/abs/1005.0435v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

We report La-139 Nuclear Magnetic Resonance (NMR) data in La4Ni3O8 which reveals the presence of antiferromagnetic order below T_N ~ 105 K. This compound contains two-dimensional layers of NiO2 that are isostructural to the copper oxide planes of the high temperature superconductors. This compound is remarkable because the average Ni valence of 1.33+ for formally 2Ni1+ + Ni2+ indicates a 3d9/3d8 electronic configuration. Nickel oxides with Ni1+ valence are rare and unstable, yet may provide new routes to high temperature superconductivity. La4Ni3O8, with antiferromagnetic order of S=1/2 Ni1+ spins, is analogous to the parent compounds of the cuprate superconductors. Our data clearly reveal dramatic spectral changes and low energy antiferromagnetic correlations associated with the onset of long range order below T_N.

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