Proton spin-lattice relaxation times in ytterbium hydrides |
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Authors: | O J Żogaŀ H Valentin B Gotschy M Drulis W Iwasieczko |
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Institution: | (1) Lehrstuhl für Experimentalphysik II, Universität Bayreuth, D-95447 Bayreuth, Germany;(2) Institute for Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, PL-50-950 Wrocaw, Poland |
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Abstract: | The measurements of the proton (NMR) spinlattice relaxation times have been made in a series of ytterbium hydrides, YbH
x
. Results are reported forx=1.80, 1.95, 2.00 and 2.62 and temperatures 4.2T297K. In the orthorhombic phase (1.80x2.00), the spin-lattice relaxation times are dominated by the hyperfine interaction of protons with conduction electrons and the spin diffusion mechanism. In the cubic phase (x=2.62), the relaxation times are five orders of magnitude shorter than in the orthorhombic one. This is interpreted in terms of the proton coupling with the Yb3+ ion spin fluctuations. |
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Keywords: | 75 30 M 76 60 E 75 40 G |
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