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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

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 1T ₁ is rapidly suppressed in a small magnetic field, indicating that it is due to remarkably slow diamagnetic fluctuations which are undetectable with conventional NMR.

Original language	English
Article number	220501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.85.220501
State	Published - 4 Jun 2012
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.85.220501

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Morenzoni, E., Saadaoui, H., Wang, D., Horisberger, M., Kirk, E. C., MacFarlane, W. A., Morris, G. D., Chow, K. H., Hossain, M. D., Levy, C. P., Parolin, T. J., Pearson, M. R., Song, Q., & Kiefl, R. F. (2012). Slow order-parameter fluctuations in superconducting Pb and Ag/Nb films observed using β-detected nuclear magnetic resonance. Physical Review B - Condensed Matter and Materials Physics, 85(22), Article 220501. https://doi.org/10.1103/PhysRevB.85.220501

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title = "Slow order-parameter fluctuations in superconducting Pb and Ag/Nb films observed using β-detected nuclear magnetic resonance",

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 1T 1 is rapidly suppressed in a small magnetic field, indicating that it is due to remarkably slow diamagnetic fluctuations which are undetectable with conventional NMR.",

author = "E. Morenzoni and H. Saadaoui and D. Wang and M. Horisberger and Kirk, \{E. C.\} 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 Q. Song and Kiefl, \{R. F.\}",

year = "2012",

month = jun,

day = "4",

doi = "10.1103/PhysRevB.85.220501",

language = "English",

volume = "85",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "22",

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Morenzoni, E, Saadaoui, H, Wang, D, Horisberger, M, Kirk, EC, MacFarlane, WA, Morris, GD, Chow, KH, Hossain, MD, Levy, CP, Parolin, TJ, Pearson, MR, Song, Q & Kiefl, RF 2012, 'Slow order-parameter fluctuations in superconducting Pb and Ag/Nb films observed using β-detected nuclear magnetic resonance', Physical Review B - Condensed Matter and Materials Physics, vol. 85, no. 22, 220501. https://doi.org/10.1103/PhysRevB.85.220501

TY - JOUR

T1 - Slow order-parameter fluctuations in superconducting Pb and Ag/Nb films observed using β-detected nuclear magnetic resonance

AU - Morenzoni, E.

AU - Saadaoui, H.

AU - Wang, D.

AU - Horisberger, M.

AU - Kirk, E. C.

AU - MacFarlane, W. A.

AU - Morris, G. D.

AU - Chow, K. H.

AU - Hossain, M. D.

AU - Levy, C. P.

AU - Parolin, T. J.

AU - Pearson, M. R.

AU - Song, Q.

AU - Kiefl, R. F.

PY - 2012/6/4

Y1 - 2012/6/4

N2 - 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 1T 1 is rapidly suppressed in a small magnetic field, indicating that it is due to remarkably slow diamagnetic fluctuations which are undetectable with conventional NMR.

AB - 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 1T 1 is rapidly suppressed in a small magnetic field, indicating that it is due to remarkably slow diamagnetic fluctuations which are undetectable with conventional NMR.

UR - https://www.scopus.com/pages/publications/84862224505

U2 - 10.1103/PhysRevB.85.220501

DO - 10.1103/PhysRevB.85.220501

M3 - Article

AN - SCOPUS:84862224505

SN - 1098-0121

VL - 85

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 22

M1 - 220501

ER -

Slow order-parameter fluctuations in superconducting Pb and Ag/Nb films observed using β-detected nuclear magnetic resonance

Abstract

ASJC Scopus subject areas

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