Fermi Surface and Pseudogap Evolution in a Cuprate Superconductor
Fermi Surface and Pseudogap Evolution in a Cuprate Superconductor
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DOI：
10.1126/science.1248221
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发表时间：
2014-05-09
期刊：
影响因子：
56.9
通讯作者：
Hoffman, J. E.
中科院分区：
文献类型：
--
作者：
He, Yang;Yin, Yi;Hoffman, J. E.
铜氧化物超导电性与赝能隙态之间的关系尚不清楚，这是理解高转变温度（Tc）超导机制的一个障碍。在这里，我们使用依赖于磁场的扫描隧道显微镜，以提供相敏的证据，d波超导共存的赝隙的反节费米表面上的过掺杂的铜酸盐。此外，通过跟踪一个单一的铋基铜酸盐家族的准粒子干涉图案的空穴掺杂（p）的依赖性，我们观察到费米表面重建略低于最佳掺杂，表明零场量子相变显着接近最大超导Tc。令人惊讶的是，这一重大重组系统的基本电子结构没有影响的顺利发展的赝隙。
The unclear relationship between cuprate superconductivity and the pseudogap state remains an impediment to understanding the high transition temperature (T-c) superconducting mechanism. Here, we used magnetic field-dependent scanning tunneling microscopy to provide phase-sensitive proof that d-wave superconductivity coexists with the pseudogap on the antinodal Fermi surface of an overdoped cuprate. Furthermore, by tracking the hole-doping (p) dependence of the quasi-particle interference pattern within a single bismuth-based cuprate family, we observed a Fermi surface reconstruction slightly below optimal doping, indicating a zero-field quantum phase transition in notable proximity to the maximum superconducting T-c. Surprisingly, this major reorganization of the system's underlying electronic structure has no effect on the smoothly evolving pseudogap.