High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors
cond-mat.supr-con
/ Authors
Yanan Li, Haiwen Liu, Haoran Ji, Chengcheng Ji, Shichao Qi, Xiaotong Jiao, Wenfeng Dong, Yi Sun, Wenhao Zhang, Zihan Cui
and 7 more authors
Minghu Pan, Nitin Samarth, Lili Wang, X. C. Xie, Qi-Kun Xue, Yi Liu, Jian Wang
/ Abstract
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.