Spontaneous magnetic moments in YBCO thin films

Details Spontaneous magnetic moments in YBCO thin films Spontaneous magnetic moments in YBCO thin films

2000-03-07

arxiv.org/abs/cond-mat/0003106v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.62.13934

We have observed spontaneous magnetic moments with random signs in c-axis oriented thin films of the high-Tc cuprate superconductor YBCO, imaged with a scanning SQUID microscope. These moments arise when the samples become superconducting, and appear to be associated with non-ferromagnetic defects in the films. In contrast with granular high-Tc samples, which also show spontaneous magnetization with random signs, these samples shield diamagnetically.

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