Nuclear Spin-Lattice Relaxation of 82BrFe |
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Authors: | C. Tramm P. D. Eversheim P. Herzog |
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Affiliation: | 1. Helmholtz-Institut für Strahlen-und Kernphysik der Universit?t Bonn, D-53115, Bonn, Germany
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Abstract: | The field dependence of the nuclear spin-lattice relaxation (SLR) of cold implanted 82Br (T ≤ 25 mK) in α-Fe single crystals was investigated with nuclear magnetic resonance of oriented nuclei (NMR/ON) at low temperatures as experimental technique. The SLR at the lattice sites with the hyperfine fields found by earlier NMR/ON experiments was measured as a function of the applied external magnetic field B ext parallel to the three principle axes [100], [110] and [111] of the iron single crystal. The data were evaluated with the full relaxation formalism in the single impurity limit and for comparison also with the often employed model of a single exponential function with an effective relaxation time T 1′. With a phenomenological model the high field values of the relaxation rates r ∞, [100]′ = 6.6(2) · 10−15 T2sK−1, r ∞, [110] = 5.4(2) · 10−15 T2sK−1 and r ∞, [111] = 5.2(1) · 10−15 T2sK−1 were obtained. |
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Keywords: | field dependence low temperature nuclear orientation nuclear magnetic resonance spin-lattice relaxation |
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