Search for broken time-reversal symmetry near the surface of YBCO films using Beta-NMR

Details Search for broken time-reversal symmetry near the surface of YBCO films using Beta-NMR Search for broken time-reversal symmetry near the surface of YBCO films using Beta-NMR

2011-01-05

arxiv.org/abs/1101.0930v1

Phys. Rev. B 83, 054504 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.83.054504

Weak spontaneous magnetic fields are observed near the surface of YBCO films using Beta-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/YBCO interface. The magnitude of the line broadening at 10 K 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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