We measured the Al-27 and B-11 NMR spin lattice relaxation rates and the isotropic Knight shifts in powder samples of Mg1-xAlxB2. The comparison with band structure calculations allows the experimental determination of the partial DOS and its dependence upon the Al concentration x. Agreement is obtained for its absolute values as well as for its behavior upon doping. The satisfactory understanding of the electronic wave function around the probe nuclei validates our determination of a surprisingly large Korringa ratio, from the comparison between Al-27 relaxations and shifts, which can only partially be attributed to Al disorder.
NMR determination of the partial density of states and of the electronic correlation in Mg1-xAlxB2 / S., Serventi; Allodi, Giuseppe; Bucci, Cesare Amelio; DE RENZI, Roberto; Guidi, Germano; E., Pavarini; P., Manfrinetti; A., Palenzona. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 67:(2003), pp. 134518-1-134518-4. [10.1103/PhysRevB.67.134518]
NMR determination of the partial density of states and of the electronic correlation in 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. The comparison with band structure calculations allows the experimental determination of the partial DOS and its dependence upon the Al concentration x. Agreement is obtained for its absolute values as well as for its behavior upon doping. The satisfactory understanding of the electronic wave function around the probe nuclei validates our determination of a surprisingly large Korringa ratio, from the comparison between Al-27 relaxations and shifts, which can only partially be attributed to Al disorder.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
