C.C. Tsuei, J.R. Kirtley, et al.
Journal of Physics and Chemistry of Solids
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.
C.C. Tsuei, J.R. Kirtley, et al.
Journal of Physics and Chemistry of Solids
R.P. Huebener, C.C. Tsuei
Cryogenics
C.C. Tsuei, J.R. Kirtley
Journal of Physics and Chemistry of Solids
A. Davidson, C.C. Tsuei
Physica B+C