LaNiO3 is a transition-metal oxide with Perovskite crystal structure where Ni is in the low spin state of t62e 1g. It is a metal and shows enhanced susceptibility χ with a strong temperature (T) dependence at low T. We have carried out a 139 La NMR study in the poly crystal sample in the temperature range between 1.4 K and 300 K. We find that the uniform spin susceptibility is T-independent which suggests that the low-T upturn in χ is an extrinsic property of the metallic state. The results of the Knight shift and the nuclear spin relaxation rate indicate that the spin susceptibility is almost wave-vector (q) independent, implying that the electron correlation is dominantly due to a band narrowing, mass enhancement, effect near a metal-insulator transition, rather than to a ferromagnetic interaction peaked at q=O.
|Number of pages||3|
|Journal||journal of the physical society of japan|
|Publication status||Published - 2002|
- Mass enhancement
- Strong correlation
ASJC Scopus subject areas
- Physics and Astronomy(all)