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Condensed Matter > Strongly Correlated Electrons

arXiv:1812.09844 (cond-mat)
[Submitted on 24 Dec 2018]

Title:Orbital-selective confinement effect of Ru $4d$ orbitals in SrRuO$_3$ ultrathin film

Authors:Soonmin Kang, Yi Tseng, Beom Hyun Kim, Seokhwan Yun, Byungmin Sohn, Bongju Kim, Daniel McNally, Eugenio Paris, Choong H. Kim, Changyoung Kim, Tae Won Noh, Sumio Ishihara, Thorsten Schmitt, Je-Geun Park
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Abstract:The electronic structure of SrRuO$_3$ thin film with thickness from 50 to 1 unit cell (u.c.) is investigated via the resonant inelastic x-ray scattering (RIXS) technique at the O K-edge to unravel the intriguing interplay of orbital and charge degrees of freedom. We found that orbital-selective quantum confinement effect (QCE) induces the splitting of Ru $4d$ orbitals. At the same time, we observed a clear suppression of the electron-hole continuum across the metal-to-insulator transition (MIT) occurring at the 4 u.c. sample. From these two clear observations we conclude that QCE gives rise to a Mott insulating phase in ultrathin SrRuO$_3$ films. Our interpretation of the RIXS spectra is supported by the configuration interaction calculations of RuO$_6$ clusters.
Comments: 7 pages, 7 figures
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:1812.09844 [cond-mat.str-el]
  (or arXiv:1812.09844v1 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.1812.09844
Related DOI: https://doi.org/10.1103/PhysRevB.99.045113

Submission history

From: Soonmin Kang [view email]
[v1] Mon, 24 Dec 2018 06:37:29 UTC (3,523 KB)
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