Field induced Kosterlitz–Thouless transition in two-dimensional array of Josephson junctions

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• 作者：S. Sergeenkov^a ; ^{sergei@df.ufscar.br"" rel=""nofollow} ; V.A.G. Rivera^b ; E. Marega^b ; F.M. Araujo-Moreira^a
• 关键词：D. Josephson junction arrays ; D. Current– ; voltage characteristics ; D. Differential magnetoresistance ; D. Kosterlitz– ; Thouless transition
• 刊名：Solid State Communications
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：151
• 期：12
• 页码：892-894
• 全文大小：343 K

文摘

We present recent results on the magnetic field dependence of current–voltage characteristics (CVC) for an artificially prepared two-dimensional array of unshunted Nb–AlO_x–Nb Josephson junctions. The results obtained from the measured CVC and critical current I_C(T,H) differential magnetoresistance (DMR) of the array are found to exhibit behavior compatible with field induced Kosterlitz–Thouless transition describing unbinding of vortex–antivortex pairs under applied magnetic field.