Details

Autor(en) / Beteiligte

• Wu, Meng
• Huang, Si Zhao
• Zeng, Hui
• Koster, Gertjan
• Huang, Yu Yang
• Zheng, Jin Cheng
• Wang, Hui Qiong

Titel

Asymmetric response of electrical conductivity and V valence state to strain in cation-deficient Sr 1-y VO 3 ultrathin films based on absorption measurements at the V L 2 - and L 3 -edges

Ist Teil von

• Journal of synchrotron radiation, 2019-09, Vol.26 (Pt 5), p.1687-1693

Ort / Verlag

United States

Erscheinungsjahr

2019

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• The correlation between electronic properties and epitaxial strain in a cation-deficient system has rarely been investigated. Cation-deficient SrVO films are taken as a model system to investigate the strain-dependent electrical and electronic properties. Using element- and charge-sensitive soft X-ray absorption, V L-edge absorption measurements have been performed for Sr VO films of different thicknesses capped with 4 u.c. (unit cell) SrTiO layers, showing the coexistence of V and V in thick films. A different correlation between V valence state and epitaxial strain is observed for Sr VO ultrathin films, i.e. a variation in V valence state is only observed for tensile-strained films. Sr VO thin films are metallic and exhibit a thickness-driven metal-insulator transition at different critical thicknesses for tensile and compressive strains. The asymmetric response of electrical conductivity to strain observed in cation-deficient Sr VO films will be beneficial for functional oxide electronic devices.