Effect of screening current induced pair breaking on magnetization of superconducting lead nanoparticles
- 作者：G. Yashwant ; C.L. Prajapat ; O.D. Jayakumar ; M.R. Singh ; S.K. Gupta ; A.K. Tyagi ; G. Ravikumar
- 关键词：Nanoparticle ; Screening current ; Magnetization
- 刊名：Physica C
- 出版年：2008
- 期刊代码：80_09214534
- 类别：ms
- 出版时间：15 June 2008
- 卷：468
- 期：11-12
- 页码：944-947
- 文件大小：253 K
摘要
Magnetization measurements on lead nanoparticles in the size range 35–45 nm are presented. It is shown that the critical fields in these nanoparticles are enhanced significantly above their bulk values with temperature dependence also distinct from that of bulk. The observed “type IIȁd; like shape of the magnetization curves is explained on the basis of the Ginzburg–Landau phenomenology by invoking the pair breaking effect of the London screening currents, which makes the effective penetration depth an increasing function of the field. The temperature dependence of critical field is found to be consistent with our explanation.