Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4

Details Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4 Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4

2006-12-21

arxiv.org/abs/cond-mat/0612539v1

Phys. Rev. Lett. 98.216403 (May 24, 2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.216403

A new concept is proposed for the paramagnetic metal insulator transition in the layer perovskite Ca_{2-x}Sr_xRuO_4. Whereas the pure Sr compound is metallic up to very large Coulomb energies due to strong orbital fluctuations, structural changes induced by doping with Ca give rise to a interorbital charge transfer which makes the material extremely sensitive to local correlations. Using dynamical mean field theory based on finite temperature multi-band exact diagonalization it is shown that the combination of crystal field splitting and onsite Coulomb interactions leads to complete filling of the d_xy band and to a Mott transition in the half-filled d_xz,yz bands.

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