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Springer, Pramana - Journal of Physics, 5-6(58), p. 959-963, 2002

DOI: 10.1007/s12043-002-0200-7

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Effect of swift heavy ion irradiation on surface resistance of DyBa2Cu3O7−δ thin films at microwave frequencies

Journal article published in 2002 by Bhangale Ar, Ujwala Ail, Tamalika Banerjee ORCID, A. R. Bhangale, D. Kanjilal, R. Pinto
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We report the observation of a pronounced peak in surface resistance at microwave frequencies of 4.88 GHz and 9.55 GHz and its disappearance after irradiation with swift ions in laser ablated DyBa2Cu3O7−δ (DBCO) thin films. The measurements were carried out in zero field as well as in the presence of magnetic fields (up to 0.8 T). The films were irradiated using 90 MeV oxygen ions at Nuclear Science Centre, New Delhi at a fluence of 3 × 10^13 ions/cm2. Introduction of point defects and extended defects after irradiation suppresses the peak at 9.55 GHz whereas no suppression is observed at 4.88 GHz. These results and the vortex dynamics in the films at microwave frequencies before and after irradiation are discussed.