We report La139 nuclear magnetic resonance data in La4Ni 3O8 that reveal the presence of antiferromagnetic order below TN∼105 K. This remarkable compound contains two-dimensional (2D) layers of NiO2 with unusual Ni valences. La4Ni 3O8, with antiferromagnetic order of S=1/2Ni1+ 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 TN. These critical spin fluctuations, however, do not diverge at the second-order phase transition but rather appear to be associated with a T=0 transition characteristic of 2D spin fluctuations.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 10 2011|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics