On the Orbital Magnetic Moment of V Ion in Vanadium Perovskites(Condensed Matter : Electric Structure, Electical, Magnetic and Optical Properties)

概要

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The effect of the 3d spin-orbit interaction (SOI) on the magnitude of orbital magnetic moment (M_L) of the trivalent vanadium ion with two t_2g electrons in perovskite-type antiferromagnetic vanadates is discussed on the basis of a tight-binding model taking into account the 3d-3d multipole interaction. The second order perturbational calculation with respect to the electron transfer between V ions shows that 501 induces, for the so-called G-type antiferromagnetism (AF) accompanied by the so-called C-type orbital ordering, M_L which tends to -1μ_B [antiparallel to the spin moment (M_S) of 2μ_B corresponding to spin S = 1] in the vanishing C-type Jahn-Teller distortion. For the C-type AF accompanied by the G-type orbital ordering, on the other hand, the induced M_L is shown to reduce the perturbational energy gain especially in the c-direction. On the basis of these, we propose the magnitude of several tenths μ_B for V ion and discuss its 3d orbital state in vanadates including LaVO_3 and YVO_3 by bearing in mind the Jahn-Teller distortion.
社団法人日本物理学会の論文
2003-01-15