Zhang Xi, Kim Gowoon, Yang Qian, Wei Jiake, Feng Bin, Ikuhara Yuichi, Ohta Hiromichi
Research Institute for Electronic Science, Hokkaido University, N20W10, Kita, Sapporo 001-0020, Japan.
Graduate School of Information Science and Technology, Hokkaido University, N14W9, Kita, Sapporo 060-0814, Japan.
ACS Appl Mater Interfaces. 2021 Nov 17;13(45):54204-54209. doi: 10.1021/acsami.1c17014. Epub 2021 Nov 4.
Controlling the oxygen content can manipulate the electrical conductivity of transition metal oxides (TMOs). Although the superconductor-metal-insulator transition is useful for functional devices, an electrical path must be developed to manipulate the oxygen deficiency (δ) while maintaining the solid state. YBaCuO (YBCO, 0 ≤ δ ≤ 1) is a high transition temperature () TMO that can be modulated from a superconductor ( ≈ 92 K when δ = 0) to an insulator (δ ≈ 1). Here, we show a simple and efficient way to manipulate δ in YBCO films using a solid-state electrochemical redox treatment. Applying a negative voltage injects oxide ions to the YBCO films, increasing . Employing a positive voltage suppresses the superconducting transition and modulates the electrical conductivity. The present results demonstrate that the superconductor-metal-insulator transition of YBCO is modulated electrochemically in the solid state, opening possibilities of superconducting oxide-based device applications.
控制氧含量可以调控过渡金属氧化物（TMOs）的电导率。尽管超导体-金属-绝缘体转变对功能器件很有用，但必须开发一条电通路来调控氧缺陷（δ），同时保持固态。钇钡铜氧（YBCO，0≤δ≤1）是一种高转变温度（）的TMO，它可以从超导体（当δ = 0时，≈92 K）调制为绝缘体（δ≈1）。在此，我们展示了一种使用固态电化学氧化还原处理来调控YBCO薄膜中δ的简单有效方法。施加负电压会向YBCO薄膜注入氧离子，增加。施加正电压会抑制超导转变并调控电导率。目前的结果表明，YBCO的超导体-金属-绝缘体转变在固态下通过电化学方式进行调制，为基于超导氧化物的器件应用开辟了可能性。
