Using a scanning SQUID to determine the symmetry of the order parameter in YBCO

Using a scanning SQUID to determine the symmetry of the order parameter in YBCO

We have determined the time and spatial symmetry of the superconducting order parameter in YBa/sub 2/Cu/sub 3/O/sub 7/ (YBCO) by using a Scanning SQUID Microscope to perform a time-reversal invariance test. We find the order parameter in YBCO has a time-reversal invariant d(x/sup 2/-y/sup 2/) symmet...

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Veröffentlicht in:IEEE transactions on applied superconductivity 1995-06, Vol.5 (2), p.3233-3237
Hauptverfasser: Mathai, A., Gim, Y., Black, R.C., Amar, A., Wellstood, F.C.
Format: Artikel
Sprache:eng
Schlagworte:
Critical current
High temperature superconductors
Josephson junctions
Magnetic field measurement
Magnetic fields
Microscopy
Physics
SQUIDs
Superconductivity
Yttrium barium copper oxide
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Zusammenfassung:We have determined the time and spatial symmetry of the superconducting order parameter in YBa/sub 2/Cu/sub 3/O/sub 7/ (YBCO) by using a Scanning SQUID Microscope to perform a time-reversal invariance test. We find the order parameter in YBCO has a time-reversal invariant d(x/sup 2/-y/sup 2/) symmetric component. In addition, we find that the amplitude of any imaginary isotropic s-wave symmetric component must be less than 6% and any real isotropic s-wave component less than 89%.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.403280