Journal
PHYSICAL REVIEW B
Volume 79, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.144518
Keywords
electron spin polarisation; fluctuations in superconductors; Meissner effect; niobium compounds; nuclear magnetic resonance; penetration depth (superconductivity); superconducting energy gap; superconducting materials
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A low energy beam of spin polarized Li-8 has been used to investigate nuclear spin relaxation in the multiband superconductor NbSe2. In low magnetic fields there is significant cross relaxation between the Li-8 and the host Nb-93 spins, which is driven by low frequency fluctuations in the nuclear magnetic dipolar interaction. The rate of cross relaxation is strongly field dependent and thus the 1/T-1 spin relaxation rate of the Li-8 is a sensitive monitor of the static local magnetic field B just below the surface. This in turn is used to determine the absolute value of the magnetic penetration depth lambda in the Meissner state. The temperature variations in 1/T-1 and lambda are consistent with a wide distribution of superconducting gaps expected for a multiband superconductor.
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