Phys. Rev. B 77, 104416 (2008) [6 pages]High temperature ferromagnetism in single crystalline dilute Fe-doped BaTiO3Received 7 November 2007; published 11 March 2008 We report the observation of room temperature ferromagnetism in high quality, single crystalline dilute Fe-doped BaTiO3. The large equilibrium solubility of Fe ions in the matrix refutes uncertainties about secondary phase magnetism, which has often eclipsed this interesting field of research. While room temperature ferromagnetism is observed at and above 5% Fe concentrations, one finds a highly concave temperature dependence of the susceptibility. Using detailed ab initio calculation, this has been related to intrinsic magnetic inhomogeneities arising from positional disorder. Apart from providing a mechanism for the observed high temperature ferromagnetism, our results point out that intrinsic disorder is a generic and essential component of dilute magnetism. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.104416
DOI:
10.1103/PhysRevB.77.104416
PACS:
75.50.Pp, 61.72.J−, 71.20.−b, 77.22.−d
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