Orbital Switching and the First-Order Insulator-Metal Transition in Paramagnetic V_2O_3

Details Orbital Switching and the First-Order Insulator-Metal Transition in Paramagnetic V_2O_3 Orbital Switching and the First-Order Insulator-Metal Transition in Paramagnetic V_2O_3

2002-11-11

arxiv.org/abs/cond-mat/0211210v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.91.156402

The first-order metal-insulator transition (MIT) in paramagnetic $V_{2}O_{3}$ is studied within the ab-initio scheme LDA+DMFT, which merges the local density approximation (LDA) with dynamical mean field theory (DMFT). With a fixed value of the Coulomb $U=6.0 eV$, we show how the abrupt pressure driven MIT is understood in a new picture: pressure-induced decrease of the trigonal distortion within the strong correlation scenario (which is not obtained within LDA). We find good quantitative agreement with $(i)$ switch of the orbital occupation of $(a_{1g},e_{g1}^{\pi}, e_{g2}^{\pi})$ and the spin state S=1 across the MIT, $(ii)$ thermodynamics and $dc$ resistivity, and $(iii)$ the one-electron spectral function, within this new scenario.

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