YBA2CU3O7-DELTA-BASED, EDGE-GEOMETRY SNS JOSEPHSON-JUNCTIONS WITH LOW-RESISTIVITY PRBA2CU3O7-DELTA BARRIERS

被引：31

作者：

BARNER, JB

HUNT, BD

FOOTE, MC

PIKE, WT

VASQUEZ, RP

机构：

[1] Center for Space Microelectronics Technology, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099

来源：

PHYSICA C | 1993年 / 207卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(93)90320-P

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigated the properties of all-high-T(c) edge-geometry Josephson weak links using superconducting YBa2Cu3O7-delta (YBCO) electrodes and PrBa2Cu3O7-delta (PBCO) normal-metal layers. The fabrication of the weak links involved first ion-milling the base YBCO film using a MgO mask to form the edge and then depositing PBCO and YBCO layers in situ by pulsed-laser deposition. The optimum PBCO films had resistivities of 2 to 4 mOMEGA cm at room temperature and approximately 30 mOMEGA cm at 4.2 K. Current-versus-voltage (I-V) characteristics were qualitatively consistent with the resistively-shunted-junction (RSJ) model. Strong Shapiro steps were present in the I-V characteristics of junctions under microwave irradiation and the critical current of the devices modulated with a Fraunhofer-like dependence asa function of magnetic field. The device parameters exhibited good scaling with area and PBCO thickness. The critical-current density varied exponentially with PBCO thickness, yielding a normal-metal coherence length of 9 nm for the PBCO.

引用

页码：381 / 390

页数：10

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