Noise properties of (Hg0.9Re0.1)Ba2CaCu2Oy dc superconducting quantum interference device on (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 substrates

被引：2

作者：

Inoue, N

Tsukamoto, A

Sugano, T

Ogawa, A

Adachi, S

Takagi, K

Tanabe, K

机构：

[1] Hitachi Ltd, Adv Res Lab, Kokubunji, Tokyo 1858601, Japan

[2] Int Superconduct Technol Ctr, Superconduct Res Lab, Koto Ku, Tokyo 1350062, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 2002年 / 41卷 / 10B期

关键词：

SQUID; flux noise; Hg-based superconductor; thin film; grain boundary; Josephson junction; LSAT;

D O I：

10.1143/JJAP.41.L1149

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

(Hg0.9Re0.1) Ba2CaCu2Oy ((Hg, Re)-1212) grain-boundary junctions (GBJs) and de superconducting quantum interference devices (SQUIDS) were fabricated on (LaAlO3)(0.3)-(SrAl0.5Ta0.5O3)(0.7) (LSAT) bicrystal substrates and their electrical properties at 77 K were evaluated. It as confirmed that the GBJS exhibited little excess current and homogenous Current distribution. The 1/f noise of 2 x 10(-5) Phi(0)/Hz(1/2) at 1 Hz in an ac bias scheme and the white flux noise of 8 x 10(-6) Phi(0)/Hz(1/2) were obtained. These noise values are substantially lower than that of (Hg, Re)-1212 SQUIDS previously fabricated on SrTiO3 (STO) and comparable to that of SQUIDS made of high-quality YB2Cu3Oy thin films. This improvement of the flux noise can be attributed to the GBJs on LSAT much more homogeneous than those on STO Substrates.

引用

页码：L1149 / L1151

页数：3