LiFe$_{1-x}$Co$_x$As中关联铁基超导电性的量子相变
超导电性
2019-11-25 v1 介观与纳米尺度物理
摘要
非常规库珀配对与原子尺度缺陷相关的量子态之间的相互作用是一个存在许多开放问题的研究前沿。迄今为止，仅有少数高温超导体允许以广泛可调的方式研究这一复杂物理。我们利用扫描隧道显微镜（STM）成像了Co原子对LiFeCoAs体系基态的电子影响。我们观察到杂质逐渐抑制全局超导能隙，并在能隙边缘附近引入低能态，而超导电性保持在强耦合极限。出乎意料的是，在库珀对相干性被完全破坏之前，完全打开的能隙演化为节点态。我们的系统理论分析表明，这些新观测可以通过s波超导体中的非磁性玻恩极限散射效应定量理解，揭示了超导体到金属量子相变的驱动力。
引用
@article{arxiv.1910.11396,
title = {Quantum phase transition of correlated iron-based superconductivity in LiFe$_{1-x}$Co$_x$As},
author = {Jia-Xin Yin and Songtian S. Zhang and Guangyang Dai and Yuanyuan Zhao and Andreas Kreisel and Gennevieve Macam and Xianxin Wu and Hu Miao and Zhi-Quan Huang and Johannes H. J. Martiny and Brian M. Andersen and Nana Shumiya and Daniel Multer and Maksim Litskevich and Zijia Cheng and Xian Yang and Tyler A. Cochran and Guoqing Chang and Ilya Belopolski and Lingyi Xing and Xiancheng Wang and Yi Gao and Feng-Chuan Chuang and Hsin Lin and Ziqiang Wang and Changqing Jin and Yunkyu Bang and M. Zahid Hasan},
journal= {arXiv preprint arXiv:1910.11396},
year = {2019}
}
备注
22 pages, 12 figures, includes Supplementary Materials. To appear in Phys. Rev. Lett