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  3. Masahito Sakoda

Masahito Sakoda

Assistant Professor, Graduate School of Engineering, Hokkaido University*Profile is at the time of the award.

2025Inamori Research GrantsScience & Engineering

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Research topics
Mechanism of the extraordinary size effect appearing in the strongly correlated compound CaRuO3
Keyword
Summary
We have discovered a size effect in which the electrical resistivity of CaRuO3 thin films fluctuates in 25 Å cycles depending on the thickness of the film. The electrical resistivity increases by a factor of 3 billion (at low temperatures) by changing the film thickness by only 1 nanometer, exploring the possibility that CaRuO3 is insulating due to strong electron correlation and clarifying the mechanism of the novel size effect. To clarify the effect of electronic correlations, the lattice is investigated using X-ray diffraction. The lattice constant of the deposited CaRuO3 is smaller than that of the substrate. However, we find a significant lattice broadening at some film thicknesses, which exceeds the lattice constant of the substrate. The thickness dependence of the lattice will be measured to clarify the formation of insulators.

Comment

I am hoping to clarify the mechanism by which metals become insulators, and in the future, to develop this into some devices that can be returned to society.

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