High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors

Yanan Li; Haiwen Liu; Haoran Ji; Chengcheng Ji; Shichao Qi; Xiaotong Jiao; Wenfeng Dong; Yi Sun; Wenhao Zhang; Zihan Cui; Minghu Pan; Nitin Samarth; Lili Wang; X. C. Xie; Qi-Kun Xue; Yi Liu; Jian Wang

doi:10.1103/PhysRevLett.132.226003

High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors

Yanan Li, Haiwen Liu, Haoran Ji, Chengcheng Ji, Shichao Qi, Xiaotong Jiao, Wenfeng Dong, Yi Sun, Wenhao Zhang, Zihan Cui, Minghu Pan, Nitin Samarth, Lili Wang, X. C. Xie, Qi-Kun Xue, Yi Liu, Jian Wang

DOI 10.1103/PhysRevLett.132.226003 · Physical Review Letters

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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 nanohole 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	46.6	Pressure not reported	onset
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17.4	Pressure not reported	zero_resistance
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown