Resonant inelastic x-ray scattering study of doping and temperature dependence of low-energy excitations in La1xSrxVO3 thin films

Kari Ruotsalainen, Matteo Gatti, James M. Ablett, Flora Yakhou-Harris, Jean-Pascal Rueff, Adrian David, Wilfrid Prellier, and Alessandro Nicolaou
Phys. Rev. B 103, 235158 – Published 24 June 2021

Abstract

We present a temperature- and doping-dependent resonant inelastic x-ray scattering experiment at the V L2,3 and O K edges in La1xSrxVO3 thin films with x=0 and x=0.1. This material is a canonical example of a compound that exhibits a filling-control metal-insulator transition and undergoes orbital ordering and antiferromagnetic transitions at low temperature. Temperature-dependent measurements at the V L3 edge reveal an intra-t2g excitation that blueshifts by 40 meV from room temperature to 30 K at a rate that differs between the para- and antiferromagnetic phases. The line shape can be partially explained by a purely local model using crystal field theory calculations. For the low Sr concentration x=0.1, the doping is shown to affect the local electronic structure primarily on the O sites, beyond a simple Mott-Hubbard picture. Furthermore, the presence of phonon overtone features at the O K edge evidences that the low-energy part of the spectrum is dominated by phonon response.

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  • Received 8 May 2020
  • Revised 8 April 2021
  • Accepted 21 May 2021

DOI:https://doi.org/10.1103/PhysRevB.103.235158

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kari Ruotsalainen1,2,*, Matteo Gatti2,3,1, James M. Ablett1, Flora Yakhou-Harris4, Jean-Pascal Rueff1,5, Adrian David6, Wilfrid Prellier6, and Alessandro Nicolaou1,†

  • 1Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, Boîte Postale 48, F-91192 Gif-sur-Yvette, France
  • 2LSI, CNRS, CEA/DRF/IRAMIS, École Polytechnique, Institut Polytechnique de Paris, F-91120 Palaiseau, France
  • 3European Theoretical Spectroscopy Facility
  • 4ESRF, 71 avenue des Martyrs, F-38000 Grenoble, France
  • 5Laboratoire de Chimie Physique, Matière et Rayonnement, Sorbonne Université, CNRS, F-75252 Paris, France
  • 6Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, F-14050 Caen, France

  • *kari.ruotsalainen@helmholtz-berlin.de
  • alessandro.nicolaou@synchrotron-soleil.fr

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Issue

Vol. 103, Iss. 23 — 15 June 2021

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