Intrinsic Josephson properties in Pb1-ySr2Y1-xCaxCu2+yO7+δ epitaxial films

27th International Conference on Low Temperature Physics

Komori, Sachio^1 ; Kakeya, Itsuhiro^1

Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto

615-8510, Japan^1

关键词: Ambegaokar-Baratoff theory;    Film surfaces;    Intrinsic Josephson junction;    Ion-milling technique;    Mesa structure;    Standard photolithography;    Temperature dependence;    Two-step growth technique;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022025/pdf
DOI  :  10.1088/1742-6596/568/2/022025

来源: IOP

【 摘 要 】

We report The first observation of intrinsic Josephson junction (IJJ) characteristics in The Pb1-ySr2Y1-xCaxCu2+yO7+δ(Pb1212) epitaxial film. Pb1212 epitaxial film has been grown on SrTiO3(100) substrates by a two-step growth technique. A small mesa structure (S 4μm2) has been fabricated on a film surface using a standard photolithography and an Ar ion milling technique. The superconducting transition temperature of The IJJ is 43 K. At 4.2 K, The value of Jc(the critical current density) is 2.2 kA/cm2. The depth of The hysteresis defined as α (Jc+Jr)/ Jcis 0.89, where Jris The return current density. The temperature dependence of Jcshows good agreement with Ambegaokar-Baratoff theory.