Nanoscale Proximity Effect in the High-Temperature Superconductor Bi2Sr2CaCu2O8+δ Using a Scanning Tunneling Microscope
Nanoscale Proximity Effect in the High-Temperature Superconductor Bi2Sr2CaCu2O8+δ Using a Scanning Tunneling Microscope
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DOI：
10.1103/physrevlett.104.117001
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发表时间：
2010-03-19
影响因子：
8.6
通讯作者：
Yazdani, Ali
中科院分区：
文献类型：
--
作者：
Parker, Colin V.;Pushp, Aakash;Yazdani, Ali
高温铜氧化物超导体表现出极其局部的纳米级现象和对掺杂的强烈敏感性。虽然其他实验已经着眼于不同掺杂层之间的纳米级界面，我们专注于自然不均匀的纳米级区域之间的相互作用。使用扫描隧道显微镜仔细跟踪样品的同一区域作为温度的函数，我们表明，具有弱超导性的区域可以持续到高温，如果由强超导性的区域接壤。这表明，通过控制掺杂剂的分布可以提高最大可能的转变温度。
High-temperature cuprate superconductors exhibit extremely local nanoscale phenomena and strong sensitivity to doping. While other experiments have looked at nanoscale interfaces between layers of different dopings, we focus on the interplay between naturally inhomogeneous nanoscale regions. Using scanning tunneling microscopy to carefully track the same region of the sample as a function of temperature, we show that regions with weak superconductivity can persist to elevated temperatures if bordered by regions of strong superconductivity. This suggests that it may be possible to increase the maximum possible transition temperature by controlling the distribution of dopants.