THE ELECTRONIC STRUCTURE OF CaMnO, WITH 2.66 5 x I 3.00

M. ABBATE; D.Z.N. CRUZ; G. ZAMPIERI; J. BRIÁTICO; M.T. CAUSA; M. TOVAR; A. CANEIRO; B. ALASCIO; E. MORIKAWA

SOLID STATE COMMUNICATIONS

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 1997 vol. 103 p. 9 - 13

0038-1098

We studied the electronic structure of CaMnO, with 2.66 5 x 5 3.00 bymeans of soft X-ray absorption spectroscopy (XAS). The Mn 2p XASspectra present changes in the shape of the multiplets and chemical shifts.The chemical shifts indicate a decrease of the Mn 3d count as the oxygencontent increases. The Mn 2p XAS spectra are calculated projecting theatomic multiplet on the appropriate crystal field. The 0 1s XAS spectrashow an increase in the absorption intensity just above the bottom of theconduction band. This effect indicates an increase of unoccupied 0 2pstates for larger oxygen contents. The 0 1s XAS spectra are calculatedusing cluster model calculations which include charge transfer processes.We conclude that the doped holes in the CaMnO, system contain a mixtureof metal and ligand character.