NMR relaxation rates and Knight shifts in MgB2

Eva Pavarini; I. I. Mazin

doi:10.1103/PhysRevB.64.140504

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NMR relaxation rates and Knight shifts in MgB2

Eva Pavarini, I. I. Mazin

DOI 10.1103/PhysRevB.64.140504 · Physical Review B

T1

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Abstract

We calculate ab initio the NMR relaxation rates and the Knight shifts in MgB2. We show that the dominant relaxation mechanism at the 11B 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown