在La_{3-x}Sr_{x}Ni_{2}O_{7-δ}薄膜中的超导圆顶
Maosen Wang1,2, Bo Hao1,2, Wenjie Sun1,2
1Nanjing University, National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing 210093, China.
Physical review letters
|March 1, 2026
概括
在La_{3}Ni_{2}O_{7}薄膜中探索了环境压力超导性. 研究人员绘制了相位图,揭示了一个超导圆顶与电子孔交叉和异常的霍尔系数信号变化.
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
- 固态化学 固态化学
背景情况:
- 在La_{3}Ni_{2}O_{7}薄膜中的环境压力超导性为研究高温超导性提供了一个独特的平台.
- 压缩表轴应变是这些材料实现超导性的关键因素.
研究的目的:
- 系统地绘制压力应变的La_{3-x}Sr_{x}Ni_{2}O_{7-δ}薄膜的相位图.
- 为了研究兴奋剂,氧含量和超导特性之间的关系.
- 了解尼基酸盐中非传统超导的潜在机制.
主要方法:
- 薄膜沉积和表征. 薄膜沉积和表征. 薄膜沉积和表征.
- 系统调整 (Sr) 兴奋剂和氧含量.
- 测量超导过渡温度 (T_{c}) 和霍尔系数 (R_{H}).
- 对电阻和绝缘/金属系统的分析.
主要成果:
- 一个超导圆顶被揭示在相位图与电子孔交叉.
- 最大T_{c}与R_{H}中的异常标志变化相关,这表明费米表面重建.
- 观察到具有绝缘和T线性电阻的电阻模式,类似于酸盐和无限层酸盐.
结论:
- 在T_{c}和R_{H}之间建立了一个圆顶形的关系.
- 这项研究为了解酸盐系统中的非传统超导性提供了一个框架.
- 拉_{3}Ni_{2}O_{7}薄膜中的压缩应变对于探索新型超导现象至关重要.
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