Fundamental thickness limit of itinerant ferromagnetic SrRuO$_3$ thin films

Details Fundamental thickness limit of itinerant ferromagnetic SrRuO$_3$ thin films Fundamental thickness limit of itinerant ferromagnetic SrRuO$_3$ thin films

2009-03-02

arxiv.org/abs/0903.0225v2

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.057201

We report on a fundamental thickness limit of the itinerant ferromagnetic oxide SrRuO$_3$ that might arise from the orbital-selective quantum confinement effects. Experimentally, SrRuO$_3$ films remain metallic even for a thickness of 2 unit cells (uc), but the Curie temperature, T$_C$, starts to decrease at 4 uc and becomes zero at 2 uc. Using the Stoner model, we attributed the T$_C$ decrease to a decrease in the density of states (N$_o$). Namely, in the thin film geometry, the hybridized Ru-d$_yz,zx$ orbitals are terminated by top and bottom interfaces, resulting in quantum confinement and reduction of N$_o$.

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