In 2021, we discovered a novel size effect with a period of 25 Å on strongly correlated compound CaRuO3. The change in film thickness of only one nanometer leads to an increase in electrical resistivity at 4 K by a factor of several Billion. However, the excitation energy of 2.14 eV on insulating CaRuO3 is too large to explain the mechanism by conventional quantum well. In this study, we clarify that the increases in electrical resistivity are accompanied by lattice expansion and caused by the Mott transitions. We measured in-plane x-ray diffraction on CaRuO3 films and found a 24.8 Å periodic thickness oscillation of the lattice spacing d(004). We determined the nesting vector from the Fermi surface and revealed the spin density wave with a period equivalent to the size effect. We concluded that the antiferromagnetic correlation appearing in the boundary conditions triggers the periodic Mott insulators depending on the film thickness.
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5 May 2025
Research Article|
May 05 2025
Mott insulators appearing at a thickness period corresponding to nesting in CaRuO3 Available to Purchase
M. Sakoda
;
M. Sakoda
a)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Hokkaido, Japan
a)Author to whom correspondence should be addressed: [email protected]
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H. Nobukane
;
H. Nobukane
(Data curation, Validation, Writing – review & editing)
2
Department of Physics, Graduate School of Science, Hokkaido University
, Sapporo 060-0810, Hokkaido, Japan
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S. Shimoda;
S. Shimoda
(Data curation, Formal analysis, Methodology, Validation, Writing – review & editing)
3
Institute for Catalysis, Hokkaido University
, Sapporo 001-0021, Hokkaido, Japan
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K. Ichimura
K. Ichimura
(Project administration, Resources, Supervision, Writing – review & editing)
1
Department of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Hokkaido, Japan
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M. Sakoda
1,a)
H. Nobukane
2
S. Shimoda
3
K. Ichimura
1
1
Department of Applied Physics, Graduate School of Engineering, Hokkaido University
, Sapporo 060-8628, Hokkaido, Japan
2
Department of Physics, Graduate School of Science, Hokkaido University
, Sapporo 060-0810, Hokkaido, Japan
3
Institute for Catalysis, Hokkaido University
, Sapporo 001-0021, Hokkaido, Japan
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 126, 183101 (2025)
Article history
Received:
February 24 2025
Accepted:
April 24 2025
Citation
M. Sakoda, H. Nobukane, S. Shimoda, K. Ichimura; Mott insulators appearing at a thickness period corresponding to nesting in CaRuO3. Appl. Phys. Lett. 5 May 2025; 126 (18): 183101. https://doi.org/10.1063/5.0267360
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