O17 NMR as a conclusive probe of charge-ordering models in half-doped manganites
Abstract
We present a O17 NMR study of the half-doped manganite, Pr0.5Ca0.5MnO3 at T⩽10K . The charge-ordered and the ferromagnetic states are studied at H=0 and H=12T , respectively. Since the O17 nucleus probes spin and orbital configuration of its two first Mn neighbors, local magnetic environments of oxygen in different structural sites could be analyzed in both states. Local fields expected in two models of the charge-ordered state, the site-centered and the bond-centered ones, are compared to the experimental data. It is shown that the hierarchy of local fields at different oxygen sites favors the site-centered charge ordering with two different Mn sites.
- Publication:
-
Physical Review B
- Pub Date:
- September 2006
- DOI:
- 10.1103/PhysRevB.74.092403
- Bibcode:
- 2006PhRvB..74i2403T
- Keywords:
-
- 75.30.Et;
- 75.47.Lx;
- 76.60.Cq;
- 76.60.Jx;
- Exchange and superexchange interactions;
- Manganites;
- Chemical and Knight shifts;
- Effects of internal magnetic fields