NMR relaxation rates and Knight shifts in MgB2 -: art. no. 140504

被引：27
|
作者：
Pavarini, E [1 ]
Mazin, II
机构：
[1] Univ Pavia, Dipartimento Fis A Volta, INFM, I-27100 Pavia, Italy
[2] USN, Res Lab, Washington, DC 20375 USA
来源：
PHYSICAL REVIEW B | 2001年 / 64卷 / 14期
关键词：
D O I：
10.1103/PhysRevB.64.140504
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We calculate ab initio the NMR relaxation rates and the Knight shifts in MgB2. We show that the dominant relaxation mechanism at the B-11 nucleus is the interaction with the electronic orbital moment, and we give a simple explanation of that using a simple sp tight-binding model. When Stoner enhancement (also calculated ab initio) is accounted for, we obtain good agreement with reported experimental values. For the Mg-25 nucleus, we predict that the dominant relaxation mechanism is the Fermi-contact interaction, which also dominates the Mg Knight shift.
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页数：4
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