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Strain-induced orbital-energy shift in antiferromagnetic RuO2 revealed by resonant elastic x-ray scattering

Cornell Affiliated Author(s)

Author

B.Z. Gregory
J. Strempfer
D. Weinstock
J.P. Ruf
Y. Sun
H. Nair
N.J. Schreiber
D.G. Schlom
K.M. Shen
A. Singer

Abstract

In its ground state, RuO2 was long thought to be an ordinary metallic paramagnet. Recent neutron and x-ray diffraction revealed that bulk RuO2 is an antiferromagnet with TN above 300 K. Furthermore, epitaxial strain induces superconductivity in thin films of RuO2 below 2 K. Here, we present a resonant elastic x-ray scattering study at the RuL2 edge of the strained RuO2 films exhibiting the strain-induced superconductivity. We observe an azimuthal modulation of the 100 Bragg peak consistent with bulk. Most notably, in the strained films displaying superconductivity, we observe a ∼1eV shift of the Rueg orbitals to a higher energy. The energy shift is smaller in thicker, relaxed films and films with a different strain direction. Our results provide further evidence of the utility of epitaxial strain as a tuning parameter in complex oxides. © 2022 American Physical Society.

Date Published

Journal

Physical Review B

Volume

106

Issue

19

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85142799716&doi=10.1103%2fPhysRevB.106.195135&partnerID=40&md5=0a0bd923d01a29a4aba01f8a571ec3c4

DOI

10.1103/PhysRevB.106.195135

Group (Lab)

Kyle Shen Group

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