We have observed spontaneous magnetic moments with random signs in c-axis-oriented thin films of the high-Tc cuprate superconductor YBa2Cu3O72d , imaged with a scanning superconducting quantum interference device microscope. These moments arise when the samples become superconducting, and appear to be associated with nonferromagnetic defects in the films. In contrast with granular high-Tc samples, which also show spontaneous moments with random signs, the present samples shield diamagnetically.
Spontaneous magnetic moments in YBa2Cu3O7-x thin films
TAFURI, Francesco;
2000
Abstract
We have observed spontaneous magnetic moments with random signs in c-axis-oriented thin films of the high-Tc cuprate superconductor YBa2Cu3O72d , imaged with a scanning superconducting quantum interference device microscope. These moments arise when the samples become superconducting, and appear to be associated with nonferromagnetic defects in the films. In contrast with granular high-Tc samples, which also show spontaneous moments with random signs, the present samples shield diamagnetically.File in questo prodotto:
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