%0 Generic %1 Morenzoni2011 %A Morenzoni, E. %A Saadaoui, H. %A Wang, D. %A Horisberger, M. %A Kirk, E. %A MacFarlane, W. A. %A Morris, G. D. %A Chow, K. H. %A Hossain, M. D. %A Levy, C. P. %A Parolin, T. J. %A Pearson, M. R. %A Song, Q. %A Kiefl, R. F. %D 2011 %K fluctuations %T Observation of slow order parameter fluctuations in superconducting films using beta-detected NMR %U http://arxiv.org/abs/1109.4508 %X We report beta-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 fluctuations in the superconducting order parameter. However, the peak is more than an order of magnitude larger than the prediction based on the enhancement of the dynamic electron spin susceptibility by superconducting fluctuations and reflects the presence of unexpected slow fluctuations. Furthermore the fluctuations are rapidly suppressed in a small magnetic field, which may explain why they have not been observed previously with conventional NMR or NQR.

@misc{Morenzoni2011, abstract = { We report beta-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 fluctuations in the superconducting order parameter. However, the peak is more than an order of magnitude larger than the prediction based on the enhancement of the dynamic electron spin susceptibility by superconducting fluctuations and reflects the presence of unexpected slow fluctuations. Furthermore the fluctuations are rapidly suppressed in a small magnetic field, which may explain why they have not been observed previously with conventional NMR or NQR. }, added-at = {2011-09-23T00:27:13.000+0200}, author = {Morenzoni, E. and Saadaoui, H. and Wang, D. and Horisberger, M. and Kirk, E. and MacFarlane, W. A. and Morris, G. D. and Chow, K. H. and Hossain, M. D. and Levy, C. P. and Parolin, T. J. and Pearson, M. R. and Song, Q. and Kiefl, R. F.}, biburl = {https://www.bibsonomy.org/bibtex/2a523d7562a13b18ca553d7dba850d6d7/vakaryuk}, description = {Observation of slow order parameter fluctuations in superconducting films using beta-detected NMR}, interhash = {d300ef6bf35f2d4ce67bc56ecb3e8f3d}, intrahash = {a523d7562a13b18ca553d7dba850d6d7}, keywords = {fluctuations}, note = {cite arxiv:1109.4508 Comment: 5 pages, 2 figures}, timestamp = {2011-09-23T00:27:13.000+0200}, title = {Observation of slow order parameter fluctuations in superconducting films using beta-detected NMR}, url = {http://arxiv.org/abs/1109.4508}, year = 2011 }