The non-linear dynamics of vortices subjected to correlated and random pinning disorders in a quasi-2D superconductor

Pramana

Leena K Sahoo¹  G K Mehta²  R C Budhani¹  D Kanjilal² 

[1] Department of Physics, Indian Institute of Technology, Kanpur 208 016, India$$;Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India$$

关键词: Vortices;    quasi-2D superconductor;    correlated pinning;    non-linear dynamics.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Understanding the dynamics of vortex matter subjected to random and correlated pinning disorders in layered superconductors remains a topic of considerable interest. The dynamical behavior of vortices in these systems shows a rich variety of effects due to many competing interactions. Here, we study the ac response of as-grown as well as heavy-ion-irradiated Tl2Ba2CaCu2O8 (Tl-2212) thin films by using a micro Hall-probe susceptometer. We find that the dynamics of vortices in the high-temperature, low-field regime of the 𝐻-𝑇 phase diagram investigated here depends on the nature of pinning defects. While the decay of screening currents 𝐽(𝑡) indicates a glassy behavior in both types of samples, the nature of the glassy phase is different in the two cases. Samples with columnar defects show distinct signature of a Bose glass in the measurement of 𝐽(𝑡) and the angular dependence of the irreversibility field (𝐵irr).

【 授权许可】

Unknown