F. Tafuri, J.R. Kirtley, et al.
Applied Superconductivity 2003
We have used a high-resolution scanning SQUID microscope to directly image conventional (h/2e) Josephson vortices trapped in grain boundaries, and half-integer (h/4e) Josephson vortices trapped at the tricrystal point, of the high- Tc superconductor YBa2Cu3O7-δ grown on tricrystal substrates of SrTiO3. Our observation of the half-integer vortex at the tricrystal point is the first direct demonstration of the positive paramagnetic Meissner effect in a polycrystalline high- Tc film. In addition, our images provide the first direct measurement of the Josephson penetration depth. © 1996 American Physical Society.
F. Tafuri, J.R. Kirtley, et al.
Applied Superconductivity 2003
J.C. Tsang, Ph. Avouris, et al.
The Journal of Chemical Physics
S.I. Woods, J.R. Kirtley, et al.
Physical Review Letters
N.C. Yeh, D.S. Reed, et al.
Physical Review Letters