Low frequency electrical noise in YBa2Cu3O7
Abstract
Noise measurements of bulk and thin film YBa2Cu3O7 are prepared in order to gain an understanding of the nature of the microstructure inside a conducting material. The results of noise measurements across normal metal to superconducting YBa2Cu3O7 contacts are included. All of the observed noise varied approximately as 1/f with frequency. For both bulk and thin film YBa2Cu3O7, noise first appeared in the transition region and was in evidence all the way up to room temperature. In the bulk material, noise levels were seen to vary with sample density. For thin films, noise varied with sample orientation. An empirical equation is proposed to describe the noise across superconductor to normal conductor contacts, and the voltage spectral density of that noise is found to be proportional to the square of the contact resistance.
- Publication:
-
Superconductivity and Ceramic Superconductors II
- Pub Date:
- 1991
- Bibcode:
- 1991sccs.proc..487H
- Keywords:
-
- Electromagnetic Noise Measurement;
- High Temperature Superconductors;
- Low Frequencies;
- Mixed Oxides;
- Yttrium Oxides;
- Barium Oxides;
- Contact Resistance;
- Copper Oxides;
- Electric Contacts;
- Microstructure;
- Superconducting Films;
- Thin Films;
- Electronics and Electrical Engineering