Abstract
We have studied the magnetic properties of Ru-doped La 1.2Sr 1.8Mn 1.9Ru 0.1O 7 bilayered manganite using neutron diffraction (ND) technique. The ND measurements show that the compound exhibits ferromagnetic ordering with the spins direction parallel to the c-axis. This is in sharp contrast to the parent compound where the spins are oriented along the a– b plane. The large spin–orbit coupling constant of Ru +4 ion ( λ = ∼ 900 cm - 1 ) seems to play an important role on lifting of the orbital degeneracy of the e g state by which the e g electron prefers to occupy the d 3 z 2 - r 2 orbital and therefore, the spins align along the c-axis.
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