Peak effect at microwave frequencies in swift heavy ion irradiated YBa2Cu3O7-𝛿 thin films

Pramana

Avinash Bhangale³  R Pinto²  Tamalika Banerjee1²  D Kanjilal¹  S P Pai² 

[1] Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India$$;Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India$$;Department of Physics, Institute of Science, Mumbai 400 032, India$$

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

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The vortex dynamics at microwave frequencies in YBa2Cu3O7-𝛿 (YBCO) films have been studied. We observe a peak in the microwave (4.88 and 9.55 GHz) surface resistance in some films in magnetic fields up to 0.8 T. 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 created as a result of irradiation with 200 MeV Ag ion (at a fluence of 4 × 1010 ions/cm2) leads to the suppression of the peak in films previously exhibiting `peak effect’.

【 授权许可】

Unknown