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.

引用

页数：4

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