Search for broken time-reversal symmetry near the surface of superconducting YBa2Cu3O7-δ films using β-detected nuclear magnetic resonance

H. Saadaoui; G. D. Morris; Z. Salman; Q. Song; K. H. Chow; M. D. Hossain; C. D.P. Levy; T. J. Parolin; M. R. Pearson; M. Smadella; D. Wang; L. H. Greene; P. J. Hentges; R. F. Kiefl; W. A. MacFarlane

doi:10.1103/PhysRevB.83.054504

Search for broken time-reversal symmetry near the surface of superconducting YBa₂Cu₃O_7-δ films using β-detected nuclear magnetic resonance

H. Saadaoui, G. D. Morris, Z. Salman, Q. Song, K. H. Chow, M. D. Hossain, C. D.P. Levy, T. J. Parolin, M. R. Pearson, M. Smadella, D. Wang, L. H. Greene, P. J. Hentges, R. F. Kiefl, W. A. MacFarlane

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

Abstract

Weak spontaneous magnetic fields are observed near the surface of YBa ₂Cu₃O_7-δ films using β-detected nuclear magnetic resonance. Below T_c, the magnetic field distribution in a silver film evaporated onto the superconductor shows additional line broadening, indicating the appearance of small disordered magnetic fields. The line broadening increases linearly with a weak external magnetic field applied parallel to the surface, and is depth independent up to 45 nm from the Ag/YBa₂Cu₃O_7-δ interface. The magnitude of the line broadening extrapolated to zero applied field is less than 0.2 G, and is close to nuclear dipolar broadening in the Ag. This indicates that any fields due to broken time-reversal symmetry are less than 0.2 G.

Original language	English (US)
Article number	054504
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.83.054504
State	Published - 2011
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.83.054504

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Cite this

Saadaoui, H., Morris, G. D., Salman, Z., Song, Q., Chow, K. H., Hossain, M. D., Levy, C. D. P., Parolin, T. J., Pearson, M. R., Smadella, M., Wang, D., Greene, L. H., Hentges, P. J., Kiefl, R. F., & MacFarlane, W. A. (2011). Search for broken time-reversal symmetry near the surface of superconducting YBa₂Cu₃O_7-δ films using β-detected nuclear magnetic resonance. Physical Review B - Condensed Matter and Materials Physics, 83(5), Article 054504. https://doi.org/10.1103/PhysRevB.83.054504

Saadaoui, H, Morris, GD, Salman, Z, Song, Q, Chow, KH, Hossain, MD, Levy, CDP, Parolin, TJ, Pearson, MR, Smadella, M, Wang, D, Greene, LH, Hentges, PJ, Kiefl, RF & MacFarlane, WA 2011, 'Search for broken time-reversal symmetry near the surface of superconducting YBa₂Cu₃O_7-δ films using β-detected nuclear magnetic resonance', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 5, 054504. https://doi.org/10.1103/PhysRevB.83.054504

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title = "Search for broken time-reversal symmetry near the surface of superconducting YBa2Cu3O7-δ films using β-detected nuclear magnetic resonance",

abstract = "Weak spontaneous magnetic fields are observed near the surface of YBa 2Cu3O7-δ films using β-detected nuclear magnetic resonance. Below Tc, the magnetic field distribution in a silver film evaporated onto the superconductor shows additional line broadening, indicating the appearance of small disordered magnetic fields. The line broadening increases linearly with a weak external magnetic field applied parallel to the surface, and is depth independent up to 45 nm from the Ag/YBa2Cu3O7-δ interface. The magnitude of the line broadening extrapolated to zero applied field is less than 0.2 G, and is close to nuclear dipolar broadening in the Ag. This indicates that any fields due to broken time-reversal symmetry are less than 0.2 G.",

author = "H. Saadaoui and Morris, {G. D.} and Z. Salman and Q. Song and Chow, {K. H.} and Hossain, {M. D.} and Levy, {C. D.P.} and Parolin, {T. J.} and Pearson, {M. R.} and M. Smadella and D. Wang and Greene, {L. H.} and Hentges, {P. J.} and Kiefl, {R. F.} and MacFarlane, {W. A.}",

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AU - Saadaoui, H.

AU - Morris, G. D.

AU - Salman, Z.

AU - Song, Q.

AU - Chow, K. H.

AU - Hossain, M. D.

AU - Levy, C. D.P.

AU - Parolin, T. J.

AU - Pearson, M. R.

AU - Smadella, M.

AU - Wang, D.

AU - Greene, L. H.

AU - Hentges, P. J.

AU - Kiefl, R. F.

AU - MacFarlane, W. A.

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AB - Weak spontaneous magnetic fields are observed near the surface of YBa 2Cu3O7-δ films using β-detected nuclear magnetic resonance. Below Tc, the magnetic field distribution in a silver film evaporated onto the superconductor shows additional line broadening, indicating the appearance of small disordered magnetic fields. The line broadening increases linearly with a weak external magnetic field applied parallel to the surface, and is depth independent up to 45 nm from the Ag/YBa2Cu3O7-δ interface. The magnitude of the line broadening extrapolated to zero applied field is less than 0.2 G, and is close to nuclear dipolar broadening in the Ag. This indicates that any fields due to broken time-reversal symmetry are less than 0.2 G.

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