Resistance noise at the superconducting transition in thick films of YBa2Cu3O7−δ.

✍ Scribed by J.M. Aponte; G. Gutiérrez; M. Octavio

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 297 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(09)80274-3

✦ Synopsis

Measurements of the power spectral density of the resistance noise were performed in thick films of YBa2C~Q7-o with broad superconducting tr:r,nsitions and in the frequency range from 0.1 Hz to 100rfz. The normalized power spectrum (S IV ) of the excess noise depends on frequency as 1/f a , with a=1 over a wide range of temperature. We have also found that ft the transition, the magnitude of this excess noise shows peaks at the same temperatures at which R-(dR/dT) has peaks and also very close to the temperature at which the sample reaches its R=O state. Possible sources of noise responsible for these effects are proposed.