Z. Q. Liu, W. M. Lü, J. B. Yi, M. Yang, S. Dhar, T. Venkatesan, Ariando
Room temperature ferromagnetism observed in Nb-doped SrTiO3 (NSTO) single crystals is reported in this paper. The ferromagnetism can be eliminated by air annealing and can be again recovered by subsequent vacuum annealing. The x-ray photoemission spectroscopy (XPS) and the secondary ion mass spectroscopy (SIMS) were performed to more than 100 nm and 400 nm deep respectively below the surface to examine the magnetic impurities but no contamination was seen. The temperature dependence of magnetic moment intimately resembles the temperature dependence of carrier density suggesting an intrinsic origin of the ferromagnetism - carrier-mediated Ruderman-Kittel-Kasuya-Yosida interaction.
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http://arxiv.org/abs/1201.0579
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