F.J. Himpsel, T.A. Jung, et al.
Surface Review and Letters
Based on macroscopic quantum coherence effects arising from pair tunneling and flux quantization, a series of tricrystal experiments have been designed and carried out to test the order parameter symmetry in high-T c cuprate superconductors. By using a scanning SQUID microscope, we have directly and non-invasively observed the spontaneously generated half-integer flux quantum effect in controlled-orientation tricrystal cuprate superconducting systems. The presence or absence of the half-integer flux quantum effect as a function of the tricrystal geometry allows us to prove that the order parameter symmetry in the YBCO and T12201 systems is consistent with that of the dx2-y2pair state.
F.J. Himpsel, T.A. Jung, et al.
Surface Review and Letters
T.N. Morgan
Semiconductor Science and Technology
E. Burstein
Ferroelectrics
S. Cohen, T.O. Sedgwick, et al.
MRS Proceedings 1983