Tailoring the electronic properties of Ca$_2$RuO$_4$ via epitaxial   strain

C. Dietl; S. K. Sinha; G. Christiani; Y. Khaydukov; T. Keller; D.; Putzky; S. Ibrahimkutty; P. Wochner; G. Logvenov; P. A. van Aken; B. J. Kim,; B. Keimer

arXiv:1710.01676·cond-mat.str-el·January 18, 2018

Tailoring the electronic properties of Ca$_2$RuO$_4$ via epitaxial strain

C. Dietl, S. K. Sinha, G. Christiani, Y. Khaydukov, T. Keller, D., Putzky, S. Ibrahimkutty, P. Wochner, G. Logvenov, P. A. van Aken, B. J. Kim,, B. Keimer

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TL;DR

This study demonstrates how epitaxial strain can modify Ca$_2$RuO$_4$ thin films, transforming them from Mott insulators into metallic ferromagnets, revealing strain-induced electronic phase control.

Contribution

It presents the synthesis of strained Ca$_2$RuO$_4$ thin films and uncovers a strain-induced transition to a ferromagnetic metallic phase, a novel finding in this material.

Findings

01

Epitaxial strain induces a transition from insulating to metallic phase.

02

Metallic Ca$_2$RuO$_4$ exhibits low-temperature ferromagnetism.

03

Strain engineering enables control over electronic properties of Ca$_2$RuO$_4$.

Abstract

We report the synthesis of Ca $_{2}$ RuO $_{4}$ thin films on NdCaAlO $_{4}$ (110), LaAlO $_{3}$ (100) and LaSrAlO $_{4}$ (001) substrates and show that epitaxial strain induces a transition from the Mott-insulating phase of bulk Ca $_{2}$ RuO $_{4}$ into a metallic phase. Magnetometry and spin-polarized neutron reflectometry reveal a low-temperature, small-moment ferromagnetic state in metallic Ca $_{2}$ RuO $_{4}$ films.

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