TY - JOUR
T1 - Effect of orbital rotation and mixing on the optical properties of orthorhombic RMnO3 (R=La, Pr, Nd, Gd, and Tb)
AU - Kim, M. W.
AU - Moon, S. J.
AU - Jung, J. H.
AU - Yu, Jaejun
AU - Parashar, Sachin
AU - Murugavel, P.
AU - Lee, J. H.
AU - Noh, T. W.
PY - 2006
Y1 - 2006
N2 - We investigated the ab-plane absorption spectra of RMnO3 (R=La, Pr, Nd, Gd, and Tb) thin films. As the ionic radius of the R ion decreases, we observed a drastic suppression of the 2 eV peak, i.e., the intersite optical transition between spin- and orbital-aligned states across the Mott gap. We found that, in addition to orbital rotation, orbital mixing in the orbital-ordered state should play an important role in the suppression of 2 eV peak. We also found that the spectral weight of 2 eV peak is proportional to the A-type antiferromagnetic ordering temperature, which suggests that the magnetic interaction should be sensitively coupled to the orbital degree of freedom.
AB - We investigated the ab-plane absorption spectra of RMnO3 (R=La, Pr, Nd, Gd, and Tb) thin films. As the ionic radius of the R ion decreases, we observed a drastic suppression of the 2 eV peak, i.e., the intersite optical transition between spin- and orbital-aligned states across the Mott gap. We found that, in addition to orbital rotation, orbital mixing in the orbital-ordered state should play an important role in the suppression of 2 eV peak. We also found that the spectral weight of 2 eV peak is proportional to the A-type antiferromagnetic ordering temperature, which suggests that the magnetic interaction should be sensitively coupled to the orbital degree of freedom.
UR - http://www.scopus.com/inward/record.url?scp=33745256204&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.96.247205
DO - 10.1103/PhysRevLett.96.247205
M3 - Article
AN - SCOPUS:33745256204
SN - 0031-9007
VL - 96
JO - Physical Review Letters
JF - Physical Review Letters
IS - 24
M1 - 247205
ER -