在Tc以上的二磁性活性作为La2-xSrxCuO4薄膜中超导的前体
I Iguchi1, T Yamaguchi, A Sugimoto
1Department of Physics and CREST-JST, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan. iguchi@ap.titech.ac.jp
Nature
|July 27, 2001
概括
高温超导体呈现出前体二磁区域,高于它们的临界温度 (Tc). 扫描SQUID显微镜揭示了这些域,表明在超导完全建立之前有局部配对.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子力学就是量子力学.
背景情况:
- 超导体具有零电阻,并将磁流 (梅斯纳效应) 驱逐到临界温度 (Tc) 以下.
- 非传统的高温超导体涉及强烈的电子相关性,并表现出诸如Tc以上的伪间隙和前体旋刺激等现象.
研究的目的:
- 为了研究La2-xSrxCuO4薄膜在临界温度 (Tc) 以上和以下的磁性特性.
- 探索磁域的性质及其与高Tc材料中超导性的关系.
主要方法:
- 利用扫描SQUID (超导量子干扰装置) 显微镜进行高分辨率磁图像.
- 分析了La2-xSrxCuO4.4的薄膜.
主要成果:
- 在临界温度 (Tc) 18-19 K以下观察到清晰的量子化 vortex 模式.
- 检测到不均的磁域持续到80K,远高于Tc.
- 解释这些域为先于Meissner状态的二磁区域.
结论:
- 在Tc上方存在不均的磁域表明局部配对和二磁性是批量超导的前体.
- 阶段波动和局部超导性在高Tc超导体在临界温度以上的行为中起着至关重要的作用.
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