Abstract
Mn 3d bands in spinel-LiMn2O4 films, synthesized on SiO2-glass substrates by a sol-gel method, were studied using an optical absorption method. Two absorption peaks were observed at around 1.63 and 2.00 eV at room temperature. These peaks were associated with two d–d transitions: One is the Mn t2g to the lower Mn eg bands transition and the other the Mn t2g to the upper Mn eg bands one. A large absorption was also observed above 3.0 eV, indicating a transition from the O 2p valence band to the Mn 3d bands. The d–d transitions showed the blueshifts of 20–30 meV at 77 K comparing with those at room temperature. The observed electronic structure was consistent with the calculated one.
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