Designing ferromagnetism in vanadium-oxide based superlattices

TL;DR

This study uses dynamical mean field theory to explore how superlattice geometry influences ferromagnetism in vanadium-oxide structures, finding it limited to a small phase space and proposing design strategies to enhance ferromagnetic stability.

Contribution

It provides a theoretical analysis of ferromagnetism dependence on superlattice geometry in vanadium-oxide, offering new design criteria to potentially stabilize ferromagnetism.

Findings

Ferromagnetism occurs only in a small, possibly inaccessible phase region.

Superlattice geometry significantly affects ferromagnetic phase stability.

Proposed design criteria aim to expand ferromagnetic phase range.

Abstract

Motivated by recent reports (Phys. Rev. B\textbf{80}, 241102) of room-temperature ferromagnetism in vanadium-oxide based superlattices, a single-site dynamical mean field study of the dependence of the paramagnetic-ferromagnetic phase boundary on superlattice geometry was performed. An examination of variants of the experimentally determined crystal structure indicate that ferromagnetism is found only in a small and probably inaccessible region of the phase diagram. Design criteria for increasing the range over which ferromagnetism might exist are proposed.