NMR relaxation rates and Knight shifts in MgB2

Details NMR relaxation rates and Knight shifts in MgB2 NMR relaxation rates and Knight shifts in MgB2

2001-05-17

arxiv.org/abs/cond-mat/0105350v1

2001, Phys. Rev. B, Rapid Comm., B64, 140504

Physics

Condensed Matter

Superconductivity

4 p. RevTeX no figs

Scientific paper

10.1103/PhysRevB.64.140504

We calculate ab initio the NMR relaxation rates and the Knight shifts in MgB_2. We show that the dominant relaxation mechanism at the B 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 25Mg nucleus, we predict that the dominant relaxation mechanism is the Fermi-contact interaction, which also dominates the Mg Knight shift.

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