Shao Ting-Na, Sheng Chong, Wang Xue-Yan, Zhao Qiang, Zhu Fang-Hui, Yang Wen-Long, Dou Rui-Fen, Xiong Chang-Min, Liu Hai-Wen, Nie Jia-Cai
Institute of system Engineering, AMS, PLA, Beijing, People's Republic of China.
School of Physics and Astronomy, Beijing Normal University, Beijing, 100875, People's Republic of China.
Sci Rep. 2025 Jul 22;15(1):26517. doi: 10.1038/s41598-025-08013-2.
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 NdSrNiO 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 NdSrNiO infinite-layer thin films can provide a privileged platform for investigating the details of the anomalous metallic state in a controlled manner.
迄今为止，二维系统中异常金属态的本质仍不明确。在本研究中，我们展示了在欠掺杂的钕锶镍氧化物无限层超导薄膜中，由磁场诱导的量子超导 - 金属转变的观测结果。当施加垂直于薄膜的磁场时，我们观察到一个稳健的中间异常金属态，其特征是在低温下电阻饱和。霍尔电阻的消失和巨大的正磁阻是玻色子反常金属态的另外两个特征，就像电阻在低温下趋于饱和一样。磁场调控的钕锶镍氧化物无限层薄膜可以提供一个得天独厚的平台，用于以可控方式研究异常金属态的细节。
