Phys. Rev. Lett. 76, 1336–1339 (1996)Direct Imaging of Integer and Half-Integer Josephson Vortices in High- Tc Grain BoundariesReceived 18 August 1995; published in the issue dated 19 February 1996 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 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1336
DOI:
10.1103/PhysRevLett.76.1336
PACS:
74.60.Ge
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