Sr${}_2$(Ba${}_2$)VO${}_4$ under pressure -- an orbital switch and potential $d^1$ superconductor

Abstract

We study Sr${}_2$(Ba${}_2$)VO${}_4$ under high pressure by means of the local density approximation + dynamical mean field theory method. While Sr${}_2$VO${}_4$ is a 1/6-filling three-band system at ambient pressure with a small level splitting between the $d_{xy}$- and $d_{yz/zx}$-bands, we show that an orbital polarization occurs under uniaxial pressure, resulting in dramatic changes of the magnetic, optical, and transport properties. When pressure is applied in the $c$-direction, a $d^1$ analog of $d^9$ cuprates is realized, making Sr${}_2$(Ba${}_2$)VO${}_4$ a possible candidate for a $d^1$ superconductor. Experimentally, this uniaxial pressure can be realized by growing Ba${}_2$VO${}_4$ on a substrate with lattice constant 4.1-4.2 Å.

arXiv comment4 pages, 5 figures

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