Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-04-25
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
We investigated the $ab$-plane absorption spectra of $R$MnO$%_{3}$ ($R$ = La, Pr, Nd, Gd, and Tb) thin films. As the $R$-ion size decreases, we observed a drastic suppression of the 2 eV peak, \textit{i.e.} the inter-site optical transition between spin- and orbital-aligned states across the Mott gap. We found that both lattice distortion and the corresponding orbital mixing of the ordered orbital state should play an important role in the 2 eV peak suppression. We also found that the 2 eV spectral weight is proportional to the $A$-type antiferromagnetic ordering temperature, which suggests that the magnetic interaction might be sensitively coupled to the orbital mixing.
Jung Jae-Hun
Kim Mahn Won
Moon Soon Jae
Murugavel Pattukkannu
Noh Tae Won
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