Abstract
The orbital ordering in La 0.5 Sr 1.5 MnO 4 was studied. The single crystalline samples of La 1-x Sr 1+x MnO 4 were grown by the floating zone method. The measurements were compared with multiplet calculations to unravel the orbital character of e g electrons in the compounds. Using LDA + U band structure calculations, it was found that such a cross-type orbital ordering resulted from a combined effect of antiferromagnetic structure, Jahn-Teller distortion, and onsite Coulomb interactions.