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Superconductivity in a Mesoscopic Double Square Loop: Effect of Imperfections | | V. M. Fomin
; J. T. Devreese
; V. Bruyndoncx
; V. V. Moshchalkov
; | | Date: |
14 Dec 1999 | | Subject: | Superconductivity | cond-mat.supr-con | | Affiliation: | TFVS, Universiteit Antwerpen-UIA), J. T. Devreese (TFVS, Universiteit Antwerpen-UIA), V. Bruyndoncx (VSM, Katholieke Universiteit Leuven), V. V. Moshchalkov (VSM, Katholieke Universiteit Leuven | | Abstract: | We have generalized the network approach to include the effects of short-range imperfections in order to analyze recent experiments on mesoscopic superconducting double loops. The presence of weakly scattering imperfections causes gaps in the phase boundary $B(T)$ or $Phi(T)$ for certain intervals of $T$, which depend on the magnetic flux penetrating each loop. This is accompanied by a critical temperature $T_c(Phi)$, showing a smooth transition between symmetric and antisymmetric states. When the scattering strength of imperfections increases beyond a certain limit, gaps in the phase boundary $T_c(B)$ or $T_c(Phi)$ appear for values of magnetic flux lying in intervals around half-integer $Phi_0=hc/2e$. The critical temperature corresponding to these values of magnetic flux is determined mainly by imperfections in the central branch. The calculated phase boundary is in good agreement with experiment. | | Source: | arXiv, cond-mat/0001201 | | Services: | Forum | Review | PDF | Favorites | |
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