One-dimensional orbital excitations in vanadium oxides.
The d electron orbital is a hidden but important degree of freedom controlling novel properties of transition-metal oxides. A one-dimensional orbital system is especially intriguing due to its enhanced quantum fluctuation. We present a combined experimental and theoretical study on the Raman scattering spectra in perovskite oxides NdVO(3) and LaVO(3) to prove that the quasi-one-dimensional orbital chain described by fermionic pseudospinons bears orbital excitations exchanging occupied orbital states on the neighboring sites, termed a two-orbiton in analogy with two-magnon.
Miyasaka
S
S
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Onoda
S
S
Okimoto
Y
Y
Fujioka
J
J
Iwama
M
M
Nagaosa
N
N
Tokura
Y
Y