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NMR relaxation rates and Knight shifts in the alloy Mg1−xAlxB2

S Serventi1, G Allodi1, C Bucci1, R De Renzi1, G Guidi1, E Pavarini2, P Manfrinetti3 and A Palenzona3

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We measured the 27Al and 11B NMR spin lattice relaxation rates and the isotropic Knight shifts in powder samples of Mg1−xAlxB2, as a function of the Al concentration, x. The temperature independence of the Knight shifts and the linear temperature dependence of the relaxation are verified throughout the compositions explored. The variation with x of the measured quantities is discussed in terms of the projected densities of states at the Fermi energy, finding good qualitative as well as quantitative agreement with recent band structure calculations.


PACS

76.60.Cq Chemical and Knight shifts

74.25.Jb Electronic structure

74.70.-b Superconducting materials

76.60.Es Relaxation effects

Subjects

Superconductivity

Condensed matter: electrical, magnetic and optical

Dates

Issue 2 (February 2003)

Received 26 September 2002

Published 30 December 2002



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