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

Pramana

R Pinto2⁴  Ujwala Ail¹  A R Bhangale³  D Kanjilal²  Tamalika Banerjee⁴ 

[1] Department of Materials Science, Mangalore University, Mangalagangothri 574 199, India$$;Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India$$;Electronics Department, K.C. College, Mumbai 400 020, India$$;Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India$$

关键词: Microwave surface resistance;    superconductors;    peak effect;    ion irradiation.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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 × 1013 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.

【 授权许可】

Unknown