Spin-orbit coupling induced Mott transition in Ca2-xSrxRuO4(0 ≤ x ≤ 0.2)

Liu, G. Q.

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Spin-orbit coupling induced Mott transition in Ca_2-xSr_xRuO₄(0 ≤ x ≤ 0.2)

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Liu, G. Q.
Max Planck Society;

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Liu, G. Q. (2011). Spin-orbit coupling induced Mott transition in Ca_2-xSr_xRuO₄(0 ≤ x ≤ 0.2). Physical Review B, 84(23): 235136.

Cite as: https://hdl.handle.net/21.11116/0000-000E-BEB3-2

Abstract

We propose a mechanism for the paramagnetic metal-insulator transition in the layered perovskite Ca(2-x)Sr(x)RuO(4) (0 <= x <= 0.2). The LDA+U approach including spin-orbit coupling is used to calculate the electronic structures. In Ca(2)RuO(4), we show that the spin-orbit effect is strongly enhanced by the Coulomb repulsion, which leads to an insulating phase. When Ca is substituted by Sr, the effective spin-orbit splitting is reduced due to the increasing bandwidth of the degenerate d(xz) and d(yz) orbitals. For x = 0.2, the compound is found to be metallic. We show that these results are in good agreement with the experimental phase diagram.