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.
National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan.
D J
DJ
Huang
W B
WB
Wu
G Y
GY
Guo
H-J
HJ
Lin
T Y
TY
Hou
C F
CF
Chang
C T
CT
Chen
A
A
Fujimori
T
T
Kimura
H B
HB
Huang
A
A
Tanaka
T
T
Jo