巨大的横向电磁电阻是由于铜氧化物中阴性超导相位波动引起的
Jonatan Wårdh1, Mats Granath1, Jie Wu2,3
1Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden.
PNAS nexus
|August 21, 2023
概括
研究人员观察到La2-xSrxCuO4 (LSCO) 超导体中的电子异质性. 他们发现了巨大的横向电磁阻,并使用异构型超导体波动解释了阴性导体旋转,揭示了对酸盐超导性的洞察力.
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
- 超导电性 超导电性 超导电性
背景情况:
- 电子异质性,称为阴性性,是酸盐超导体中已知的现象,通过各种实验方法检测到.
- La2-xSrxCuO4 (LSCO) 呈现出阴影性,但之前已经观察到其阴影主管令人费解的温度依赖的旋转.
- 了解这种阴性导演旋转的起源对于理解LSCO中复杂的电子阶段至关重要.
研究的目的:
- 为了调查LSCO中阴影导体神秘的温度依赖旋转.
- 探索异型超导波动在观察到的阴性行为中的作用.
- 在LSCO中量化正常电子和库珀对的异构性.
主要方法:
- 利用角度分辨率横向磁阻 (ARTMR) 测量,这是检测运输异构的一种高度敏感的技术.
- 应用了一个理论模型,将正常 (德鲁德) 和半导体 (阿斯拉马佐夫-拉尔金) 导电率通道扩展到电子和库珀对的异型有效质量张量器.
- 通过结合异构的德鲁德和库珀对有效质量张量器,分析了 (磁导) 导电性.
主要成果:
- 在LSCO中通过使用角度解析横向电阻 (ARTR) 测量,在广泛的兴奋剂范围 (0.02 ≤ x ≤ 0.25) 中观察到电子异质性.
- 发现了巨大的横向电磁阻 (CTMR),其特点是6 T磁场下的横向电阻下降数量级.
- 证明了与正常电子流体不对齐的异型超导体波动导致明显的阴性导体旋转,表明共存的结合对齐和对角阴性秩序.
结论:
- 在LSCO中,神经主管的表面旋转归因于异型超导体波动,与共存的神经序列相一致.
- 库珀对刚性的异性比正常电子要大得多,并且在低兴奋剂状态下显著增加,导致近乎一维的波动.
- 这些发现为分析超导体中的异构电子行为提供了一个一般的框架,并建议潜在的微观模型,例如合强烈相关的梯子或接近对密度波态.
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