Orbital ordering in La0.5Sr1.5MnO4 studied by soft X-ray linear dichroism.
We found that the conventional model of orbital-ordering of 3x(2)-r(2)/3y(2)-r(2) type in the e(g) states of La0.5Sr1.5MnO4 is incompatible with measurements of linear dichroism in the Mn 2p-edge x-ray absorption, whereas these e(g) states exhibit predominantly cross-type orbital ordering of x(2)-z(2)/y(2)-z(2). LDA+U band-structure calculations reveal that such a cross-type orbital-ordering results from a combined effect of antiferromagnetic structure, Jahn-Teller distortion, and on-site Coulomb interactions.
Huang
D J
DJ
National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan.
Wu
W B
WB
Guo
G Y
GY
Lin
H-J
HJ
Hou
T Y
TY
Chang
C F
CF
Chen
C T
CT
Fujimori
A
A
Kimura
T
T
Huang
H B
HB
Tanaka
A
A
Jo
T
T