Phys. Rev. B 72, 014428 (2005) [12 pages]Magnetic properties of pure and Gd-doped EuO probed by NMRReceived 11 October 2004; revised 25 May 2005; published 14 July 2005 An Eu NMR study in the ferromagnetic phase of pure and Gd-doped EuO was performed. A complete description of the NMR line shape of pure EuO allowed for the influence of doping EuO with Gd impurities to be highlighted. The presence of a temperature-dependent static magnetic inhomogeneity in Gd-doped EuO was demonstrated by studying the temperature dependence of the line shapes. The results suggest that the inhomogeneity in 0.6% Gd-doped EuO is linked to colossal magnetoresistance. The measurement of the spin-lattice relaxation times as a function of temperature led to the determination of the value of the exchange integral J as a function of Gd doping. It was found that J is temperature independent and spatially homogeneous for all samples and that its value increases abruptly with increasing Gd doping. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.014428
DOI:
10.1103/PhysRevB.72.014428
PACS:
71.30.+h, 75.30.−m, 76.60.−k, 75.50.Pp
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