Paramagnetic Meissner Effect in Multiply-Connected Superconductors

(2) Dept of physics; (3) Northrop Grumman Corp); A. B. Cawthorne (1); A. P. Nielsen (1); C. J. Lobb(1) R. S. Newrock(2) M. G. Forrester(3) ((1) Center for Superconductivity Research; F. C. Wellstood(1); P. Barbara (1); Univ of Maryland; Univ or Cincinnati

arxiv: cond-mat/0007477 · v1 · submitted 2000-07-28 · ❄️ cond-mat.supr-con

Paramagnetic Meissner Effect in Multiply-Connected Superconductors

A. P. Nielsen (1) , A. B. Cawthorne (1) , P. Barbara (1) , F. C. Wellstood(1) , C. J. Lobb(1) R. S. Newrock(2) M. G. Forrester(3) ((1) Center for Superconductivity Research , Univ of Maryland , (2) Dept of physics , Univ or Cincinnati

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(3) Northrop Grumman Corp)

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keywords coolingfieldsparamagnetismarrayseffectfluxmeasuredmeissner

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We have measured a paramagnetic Meissner effect in Nb-Al2O3-Nb Josephson junction arrays using a scanning SQUID microscope. The arrays exhibit diamagnetism for some cooling fields and paramagnetism for other cooling fields. The measured mean magnetization is always less than 0.3 flux quantum (in terms of flux per unit cell of the array) for the range of cooling fields investigated. We demonstrate that a new model of magnetic screening, valid for multiply-connected superconductors, reproduces all of the essential features of paramagnetism that we observe and that no exotic mechanism, such as d-wave superconductivity, is needed for paramagnetism.

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Paramagnetic Meissner Effect in Multiply-Connected Superconductors

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