Silver oxonickelate Ag2NiO2 is a metallic compound presenting a spin-1/2 triangular lattice. It exhibits a structural transition at Ts ≤ 260K, which may be related to eg orbital ordering, and an antiferromagnetic transition at TN ≤ 55K. Impurity effects on its magnetic and electronic properties are examined by substituting Fe for Ni in Ag2Ni1-xFexO 2 (0≤x≤0.3). A Curie-like enhancement in magnetic susceptibility is observed at low temperature, which implies that most Fe 3+ spins behave as free spins. Moreover, a large enhancement of residual resistivity and its suppression under magnetic fields are observed. Magnetic interactions in the Ni3+ triangular lattice are discussed.
|Journal||Journal of Physics Condensed Matter|
|Publication status||Published - Apr 11 2007|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics