基于的酸盐高过渡温度谷物边界连接点和SQUID在110克尔文以上运行
Science (New York, N.Y.)
|August 19, 1994
概括
高温超导薄膜HgBa(2)CaCu(2)O(6+delta) (Hg-1212) 显示出极好的传输性能. 制造的超导量子干扰装置 (SQUID) 运行高达111.8K,可实现便携式传感器应用.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 超导电性 超导电性 超导电性
背景情况:
- HgBa ((2) CaCu ((2) O ((6+delta)) (Hg-1212) 是一种高温的铜酸超导体.
- 超导体中的颗粒边界可以作为弱环,影响临界电流密度.
- 超导量子干扰装置 (SQUID) 是敏感的磁流探测器.
研究的目的:
- 为了研究HgBa(2)CaCu(2)O(6+delta) 薄膜和谷物边界连接的超导传输特性.
- 使用这些谷物边界连接点来制造和描述SQUID.
- 评估这些设备在实际应用中的潜力.
主要方法:
- 在SrTiO(3) 双晶基板上生长HgBa(2) CaCu(2) O(6+delta) 薄膜.
- 测量临界电流密度和零电阻温度.
- 直接电流SQUID的制造和测试.
主要成果:
- HgBa(2) CaCu(2) O(6+delta) 薄膜具有120 K左右的零电阻温度和高临界电流密度 (10^6 A/cm^2在100 K).
- 颗粒边界充当弱环,将临界电流减少多达三级.
- 制造的SQUID在高达111.8K的温度下工作,并显示出明确的磁场反应.
结论:
- HgBa(2)CaCu(2)O(6+delta) 颗粒边界连接处表现出适合SQUID制造的弱链行为.
- HgBa(2)CaCu(2)O(6+delta) 的高工作温度使得SQUID成为便携式传感器和具有非传统冷却的设备的有希望的产品.
- 进一步的研究可以优化这些设备以提高性能和更广泛的应用.
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