Temperature dependence of the critical current in YBa2Cu3O7−δ and Bi2Sr2Ca1Cu2O8 Josephson junctions期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

*Temperature dependence of the critical current in YBa₂Cu₃O_7−δ and Bi₂Sr₂Ca₁Cu₂O₈ Josephson junctions*

Authors:	B A Aminov N B Brandt Nguyen Min Thuy Ya G Ponomarev and M V Sudakova A R Kaul I E Graboi and Yu D Tretiakov J Wittig S P Kobeleva and L M Fisher L Rosta

Affiliation:	Dept. of Physics, Moscow State University, 119 899, Moscow, Lenin Hill, USSR Dept. of Chemistry, Moscow State University, 119 899, Moscow, Lenin Hill, USSR Institut für Festkörperforschung, KFA Jülich, D-5170, Jülich, Fed. Rep. Germany National Institute of Electrotechnics, Moscow, ul. Kazarmennaya 12, USSR Central Research Institute for Physics, H-1525, Budapest, Pf. 49, Hungary

Abstract:	We have studied the stationary Josephson effect on YBa₂Cu₃O_7?δ (T_c=90 K) and Bi₂Sr₂Ca₁Cu₂ O₈ (T_c=80 K and 87 K for two samples of different origin) ceramic based junctions. The temperature dependence of the critical current near T_c has been found as I_c≈(T_c-T) for the Y-Ba-Cu-O samples indicating that they should be classified as S-N-I-N-S type junctions. The I-V curves of the Bi-Sr-Ca-Cu samples show the typical behaviour of S-I-S structures. Using Ambegaokar-Baratoff's theory for Bi₂Sr₂Ca₁Cu₂O₈, the temperature dependence of the superconducting state gap Δ(T) was calculated and it was evaluated that 1.452Δ(0)/k_BT_c3.5.

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