Structural, magnetic, and Mn K-edge X-ray absorption near-edge structure (XANES) spectroscopic studies have been done on the stoichiometric, hexagonal Sc1-xLuxMnO3 (0 ≤ x ≤ 1) system. The identical main threshold edge energy E0 of 6545 eV indicates trivalent Mn3+ for all samples. The triangular antiferromagnetic (AF) Néel temperature TN decreases monotonically, from 133 K for ScMnO3 to 112 K for Sc0.5Lu0.5MnO3 and 92 K for LuMnO3, due to decreasing d-p hybridization in the trigonal MnO5 block. Complex low temperature spin reorientations are observed for all samples. The K pre-edge features, with an energy separation ΔE(P2-P1) of 2.27 eV for ScMnO3 and 2.31 eV for LuMnO3, are associated with the 1s-3d quadrupole transition, which is weakly allowed through the hybridization of Mn 4p with the 3d states of neighboring Mn atoms. The P1 peak corresponds to a transition to the e′ and e″ minority spin states in the MnO5 crystal field, with the smaller P2 corresponding to the leftover e′ minority spin states.
|Number of pages||10|
|Journal||Chinese Journal of Physics|
|Publication status||Published - 2003 Dec 1|
ASJC Scopus subject areas
- Physics and Astronomy(all)