期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.107003
关键词
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资金
- European FP7 project OxIDes [CP-FP 228989-2]
- ARC
- IAP from the Belgian state-Belgian Science Policy [P6/42]
- Francqui Foundation
- Romanian National Authority for Scientific Research
- CNCS-UEFISCDI [PN-II-RU-TE-2011-3-0085]
- [FIS2009-12721-C04-02]
We report first-principles characterization of the structural and electronic properties of (SrTiO3)(5)/(SrRuO3)(1) superlattices. We show that the system exhibits a spin-polarized two-dimensional electron gas, extremely confined to the 4d orbitals of Ru in the SrRuO3 layer. Every interface in the superlattice behaves as a minority-spin half-metal ferromagnet, with a magnetic moment of mu = 2.0 mu(B)= SrRuO3 unit. The shape of the electronic density of states, half-metallicity, and magnetism are explained in terms of a simplified tight-binding model, considering only the t(2g) orbitals plus (i) the bidimensionality of the system and (ii) strong electron correlations.
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