Kondo effect goes anisotropic in vanadate oxide superlattices

TL;DR

This study reveals that in SrVO3/LaVO3 superlattices, the Kondo effect exhibits strong anisotropy influenced by growth temperature and vanadium valency, providing insights into 2D conduction and magnetic interactions.

Contribution

It demonstrates the anisotropic nature of the Kondo effect in vanadate oxide superlattices and links it to growth conditions and vanadium valency control.

Findings

Kondo-like behavior appears in resistivity and magnetoresistance.

Kondo correction is strongly anisotropic.

Growth temperature controls the Kondo contribution.

Abstract

We study the transport properties in SrVO3/LaVO3 (SVO/LVO) superlattices deposited on SrTiO3 (STO) substrates. We show that the electronic conduction occurs in the metallic LVO layers with a galvanomagnetism typical of a 2D Fermi surface. In addition, a Kondo-like component appears in both the thermal variation of resistivity and the magnetoresistance. Surprisingly, in this system where the STO interface does not contribute to the measured conduction, the Kondo correction is strongly anisotropic. We show that the growth temperature allows a direct control of this contribution. Finally, the key role of vanadium mixed valency stabilized by oxygen vacancies is enlightened.