The nature of the anomalous metal state has been a major puzzle in condensed matter physics for more than three decades. Here, we report systematic investigation and modulation of the anomalous metal states in high-temperature interface superconductor FeSe films on SrTiO3 substrate. Remarkably, under zero magnetic field, the anomalous metal state persists up to 20 K in pristine FeSe films, an exceptionally high temperature standing out from previous observations. In stark contrast, for the FeSe films with nano-hole arrays, the characteristic temperature of the anomalous metal state is considerably reduced. We demonstrate that the observed anomalous metal states originate from the quantum tunneling of vortices adjusted by the Ohmic dissipation. Our work offers a perspective for understanding the origin and modulation of the anomalous metal states in two-dimensional bosonic systems.
Cite
@article{arxiv.2111.15488,
title = {High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors},
author = {Yanan Li and Haiwen Liu and Haoran Ji and Chengcheng Ji and Shichao Qi and Xiaotong Jiao and Wenfeng Dong and Yi Sun and Wenhao Zhang and Zihan Cui and Minghu Pan and Nitin Samarth and Lili Wang and X. C. Xie and Qi-Kun Xue and Yi Liu and Jian Wang},
journal= {arXiv preprint arXiv:2111.15488},
year = {2024}
}