Magnetic properties of pure and Gd doped EuO probed by NMR

Details Magnetic properties of pure and Gd doped EuO probed by NMR Magnetic properties of pure and Gd doped EuO probed by NMR

2004-10-11

arxiv.org/abs/cond-mat/0410255v2

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 10 figures, to be published in Physical Review B

Scientific paper

10.1103/PhysRevB.72.014428

An Eu NMR study in the ferromagnetic phase of pure and Gd doped EuO was performed. A complete description of the NMR lineshape 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 lineshapes. 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 the samples and that its value increases abruptly with increasing Gd doping.

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