Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2

Details Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2 Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2

2007-05-04

arxiv.org/abs/0705.0668v3

Physical Review Letters, 99 157204 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages including 4 eps figures, improved Fig 4, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.99.157204

We report a high-resolution neutron diffraction study on the orbitally-degenerate spin-1/2 hexagonal antiferromagnet AgNiO2. A structural transition to a tripled unit cell with expanded and contracted NiO6 octahedra indicates root(3) x root(3) charge order on the Ni triangular lattice. This suggests charge order as a possible mechanism of lifting the orbital degeneracy in the presence of charge fluctuations, as an alternative to Jahn-Teller distortions. A novel magnetic ground state is observed at base temperatures with the electron-rich S = 1 Ni sites arranged in alternating ferromagnetic rows on a triangular lattice, surrounded by a honeycomb network of non-magnetic and metallic Ni ions. We also report first-principles band-structure calculations that explain microscopically the origin of these phenomena.

Affiliated with

Also associated with

No associations

Rating

Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-616292