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<p>To date, the nature of the anomalous metallic state in two-dimensional systems remains unclear. In this study, we present the observation of a quantum superconductor-to-metal transition in underdoped Nd<sub>0.85</sub>Sr<sub>0.15</sub>NiO<sub>2</sub> infinite-layer superconducting thin films, induced by a magnetic field. When a magnetic field perpendicular to the film is applied, we observed a robust intervening anomalous metallic state, characterized by a saturating resistance at low temperatures. The disappearance of Hall resistance and a huge positive magnetoresistance are the other two characteristics of boson abnormal metal state, just like the resistance tends to be saturated at low temperature. The magnetic field-regulated Nd<sub>1-x</sub>Sr<sub>x</sub>NiO<sub>2</sub> infinite-layer thin films can provide a privileged platform for investigating the details of the anomalous metallic state in a controlled manner.</p>

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Anomalous metallic state underdoped infinite-layer nickelate superconducting thin films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月22日

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  • Ting-Na Shao,
  • Chong Sheng,
  • Xue-yan Wang,
  • Qiang Zhao,
  • Fang-Hui Zhu,
  • Wen-long Yang,
  • Rui-Fen Dou,
  • Chang-Min Xiong,
  • Hai-Wen Liu,
  • Jia-Cai Nie

摘要

To date, the nature of the anomalous metallic state in two-dimensional systems remains unclear. In this study, we present the observation of a quantum superconductor-to-metal transition in underdoped Nd0.85Sr0.15NiO2 infinite-layer superconducting thin films, induced by a magnetic field. When a magnetic field perpendicular to the film is applied, we observed a robust intervening anomalous metallic state, characterized by a saturating resistance at low temperatures. The disappearance of Hall resistance and a huge positive magnetoresistance are the other two characteristics of boson abnormal metal state, just like the resistance tends to be saturated at low temperature. The magnetic field-regulated Nd1-xSrxNiO2 infinite-layer thin films can provide a privileged platform for investigating the details of the anomalous metallic state in a controlled manner.