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Peak effect at microwave frequencies in swift heavy ion irradiated YBa2Cu3O7-δthin films - investigation of vortex dynamics

Published online by Cambridge University Press:  18 March 2011

Tamalika Banerjee
Affiliation:
Department of Condensed Matter Physics & Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
A. R. Bhangale
Affiliation:
Department of Physics, Institute of Science, Mumbai 400 032 India
P. Raychaudhuri
Affiliation:
School of Physics and Astronomy, University of Birmingham, UK
D. Kanjilal
Affiliation:
Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India
R. Pinto
Affiliation:
Department of Condensed Matter Physics & Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
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Abstract

The vortex dynamics at microwave frequencies in YBa2Cu3O7-δ(YBCO) films has been studied. We observe a peak in the microwave surface resistance Rs vs. T (temperature) plots at 4.88 GHz in some films in magnetic fields (upto 0.8 T) whereas a few films do not show a pronounced peak in their surface resistance. This is associated with the ‘peak-effect’ phenomenon and reflects the order-disorder transformation of the flux-line lattice near the transition temperature. Introduction of artificial pinning centers like columnar defects as a result of irradiation with 200 MeV Ag ion leads to the suppression of the peak in films exhibiting the ‘peak-effect’. Interestingly, a peak is seen to develop in those films that initially did not show a peak in the surface resistance before irradiation. These results and the dynamics of the vortices at microwave frequencies for the unirradiated and irradiated films will be discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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Peak effect at microwave frequencies in swift heavy ion irradiated YBa2Cu3O7-δthin films - investigation of vortex dynamics
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