Conduction-electron mediated super(1)H nuclear spin-lattice relaxation in Ti sub(45 )Zr sub(38)Ni sub(17)H sub(x) icosahedral quasicrystals

Nuclear magnetic resonance spin-lattice relaxation rates for super(1)H in quasicrystalline Ti sub(45)Zr sub(38)Ni sub(17)H sub(x) are presented as a function of temperature and hydrogen concentration x. The temperature dependence demonstrates that the relaxation is via interaction with conduction el...

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Bibliographic Details
Published in:Philosophical magazine letters 2000-12, Vol.80 (12), p.763-776
Main Authors: Stojanovich, N A, Pfitsch, D W, McDowell, A F, Majzoub, E H, Kim, J Y, Kelton, K F, Adolphi, Natalie L
Format: Article
Language:English
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Summary:Nuclear magnetic resonance spin-lattice relaxation rates for super(1)H in quasicrystalline Ti sub(45)Zr sub(38)Ni sub(17)H sub(x) are presented as a function of temperature and hydrogen concentration x. The temperature dependence demonstrates that the relaxation is via interaction with conduction electrons. The relaxation rate is extremely sensitive to hydrogen content, with the rate changing by a factor of as much as two for samples that differ in x by at most 2%. We interpret the changes in the conduction-electron-mediated spin-lattice relaxation as due to fine structure ('spikiness') in the electronic density rho (E) of states and estimate that rho (E) changes by 40% over an energy range of 75 meV.
ISSN:0950-0839