We measured the Al-27 and B-11 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.
NMR relaxation rates and Knight shifts in the alloy Mg1-xAlxB2 / S., Serventi; Allodi, Giuseppe; Bucci, Cesare Amelio; DE RENZI, Roberto; Guidi, Germano; E., Pavarini; P., Manfrinetti; A., Palenzona. - In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY. - ISSN 0953-2048. - 16:(2003), pp. 152-155. [10.1088/0953-2048/16/2/304]
NMR relaxation rates and Knight shifts in the alloy Mg1-xAlxB2
ALLODI, Giuseppe;BUCCI, Cesare Amelio;DE RENZI, Roberto;GUIDI, Germano;
2003-01-01
Abstract
We measured the Al-27 and B-11 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
