Slow order-parameter fluctuations in superconducting Pb and Ag/Nb films observed using β-detected nuclear magnetic resonance
E. Morenzoni, H. Saadaoui, D. Wang, M. Horisberger, E. C. Kirk, W. A. MacFarlane, G. D. Morris, K. H. Chow, M. D. Hossain, C. P. Levy, T. J. Parolin, M. R. Pearson, Q. Song, R. F. Kiefl
DOI 10.1103/PhysRevB.85.220501 · Physical Review B
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Abstract
We report β-NMR investigations of polarized 8Li implanted in thin Pb and Ag/Nb films. At the critical superconducting temperature, we observe a singular peak in the spin relaxation rate in small longitudinal magnetic fields, which is attributed to unexpected slow fluctuations in the superconducting order parameter. The peak is several orders of magnitude larger than the prediction based on the enhancement of the dynamic electron spin susceptibility by superconducting fluctuations. The observed peak in 1T1 is rapidly suppressed in a small magnetic field, indicating that it is due to remarkably slow diamagnetic fluctuations which are undetectable with conventional NMR.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.12 | Pressure not reported | onset |
| Ag/Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.15 | Pressure not reported | onset |
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