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1/f Noise properties of swift heavy ion irradiated epitaxial thin films of YBCO
S K Arora Ravi Kumar D Kanjilal G K Mehta S Khatua R Pinto Vijay Kumar A K Gupta
High Tc Superconductors: Thin Films And Vortex Pinning Volume 22 Issue 3 May 1999 pp 251-255
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Keywords
HighTc superconductors ;thin films ;1/f noise -
Abstract
Effect of 250 MeV107Ag ion irradiation induced columnar defects on the noise properties of the YBCO superconductor in the normal and superconducting state have been investigated. Magnitude of the spectral density of the noise is found to scale inversely with the frequency and exhibit a quadratic dependence on the bias current confirming that the noise arises due to the resistance fluctuations. The magnitude ofSv has been found to decrease with decrease in temperature and shows a noise peak in the transition region. The noise performance of these materials in the vicinity of the superconducting transition as well as in the normal state is found to improve by an order of magnitude after irradiation with 250 MeV107Ag ions. The decrease in the magnitude of 1/f noise peak is due the irradiation induced enhanced flux pinning of the material which suppresses the flux motion induced noise in the vicinity ofTc.
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Author Affiliations
S K Arora1 Ravi Kumar1 D Kanjilal1 G K Mehta1 S Khatua1 2 R Pinto1 3 Vijay Kumar1 4 A K Gupta1 4
- Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi - 110 067, India
- Jai Hind College, Churchgate, Mumbai - 400 020, India
- Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai - 400 005, India
- Superconductivity Division, National Physical Laboratory, New Delhi - 110012, India
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Dates
- Published
- May 1999
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Bulletin of Materials Science
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