Origin of Narrow-band and Broadband Noise in Conduction Noise Spectra of Bi_2Sr_2CaCu_2O_y
Abstract
Conduction noise spectra were investigated in the driven vortex state of a high-temperature superconductor, Bi_2Sr_2CaCu_2Oy single crystals. Two characteristic noise features, a broad-band noise (BBN) and a narrow-band noise (NBN), were observed in the vortex solid phase. The NBN was found to originate from the washboard modulation of the translational velocity of the driven vortices [1]. To clarifify the origin of the BBN, we measured the conduction noise spectra in the sample with strip and Corbino disk geometry. The BBN was found in both configurations and showed almost similar behavior. The BBN generation irrespective of configurations strongly supports the bulk nature as its origin. [1] Y. Togawa et al., Phys. Rev. Lett. 85, 3716 (2000).
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2001
- Bibcode:
- 2001APS..MARJ28003M