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首页> 外文期刊>Physica, C. Superconductivity and its applications >Properties of ramp-edge Josephson junctions with a surface-modified barrier fabricated by high-rate PLD
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Properties of ramp-edge Josephson junctions with a surface-modified barrier fabricated by high-rate PLD

机译：高速PLD制备的带有表面修饰的势垒的坡边约瑟夫森结的性质

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摘要

YBa2Cu3O7-delta (YBCO) ramp-edge Josephson junctions have been fabricated by pulsed laser deposition (PLD) with a relatively high deposition rate (similar to 50 nm/min). 200 nm thick YBCO films deposited on LaSrAlTaOx (LSAT) substrates in a PLD system with laser-beam scanning exhibited a typical T-c of 88 similar to 90.5 K. LSAT/YBCO bilayers were fabricated and then patterned to form a ramp structure. Electron cyclotron resonance ion bombardment and subsequent annealing in a various atmosphere were employed to form an amorphous layer and a recrystallized barrier layer on the ramp surface. Junction properties strongly depend on distance between the sample and the laser plume when upper layer YBCO is deposited. The junctions fabricated under optimum conditions exhibited resistively and capacitively shunted junction-like I-V curves with a typical IcRn product at 4.2 K of 1.0 similar to 3.2 mV. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 6]
机译：YBa2Cu3O7-δ（YBCO）斜边约瑟夫森结已经通过脉冲激光沉积（PLD）以相对较高的沉积速率（类似于50 nm / min）制成。在具有激光束扫描的PLD系统中，沉积在LaSrAlTaOx（LSAT）衬底上的200 nm厚的YBCO膜表现出的典型T-c为88，类似于90.5K。制造LSAT / YBCO双层膜，然后对其进行构图以形成斜坡结构。电子回旋共振离子轰击和随后在各种气氛中的退火被用来在斜坡表面上形成非晶层和重结晶阻挡层。当沉积上层YBCO时，结的特性很大程度上取决于样品与激光羽之间的距离。在最佳条件下制作的结表现出阻性和电容性分流的结状I-V曲线，典型IcRn乘积在4.2 K为1.0时类似于3.2 mV。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：6]

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