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

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 SrTiO_{3} substrate. Remarkably, u...

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Veröffentlicht in:Physical review letters 2024-05, Vol.132 (22), p.226003, Article 226003
Hauptverfasser: Li, Yanan, Liu, Haiwen, Ji, Haoran, Ji, Chengcheng, Qi, Shichao, Jiao, Xiaotong, Dong, Wenfeng, Sun, Yi, Zhang, Wenhao, Cui, Zihan, Pan, Minghu, Samarth, Nitin, Wang, Lili, Xie, X C, Xue, Qi-Kun, Liu, Yi, Wang, Jian
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container_issue 22
container_start_page 226003
container_title Physical review letters
container_volume 132
creator Li, Yanan
Liu, Haiwen
Ji, Haoran
Ji, Chengcheng
Qi, Shichao
Jiao, Xiaotong
Dong, Wenfeng
Sun, Yi
Zhang, Wenhao
Cui, Zihan
Pan, Minghu
Samarth, Nitin
Wang, Lili
Xie, X C
Xue, Qi-Kun
Liu, Yi
Wang, Jian
description 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 SrTiO_{3} 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.
doi_str_mv 10.1103/PhysRevLett.132.226003
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title High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors
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