Title :
Using a scanning SQUID to determine the symmetry of the order parameter in YBCO
Author :
Mathai, A. ; Gim, Y. ; Black, R.C. ; Amar, A. ; Wellstood, F.C.
Author_Institution :
Dept. of Phys., Maryland Univ., College Park, MD, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
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%.<>
Keywords :
SQUIDs; barium compounds; high-temperature superconductors; symmetry; yttrium compounds; YBCO; YBa/sub 2/Cu/sub 3/O/sub 7/; isotropic s-wave; scanning SQUID microscopy; spatial symmetry; superconducting order parameter; time symmetry; time-reversal invariance; Critical current; High temperature superconductors; Josephson junctions; Magnetic field measurement; Magnetic fields; Microscopy; Physics; SQUIDs; Superconductivity; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
