Superconductivity in monoclinic TiO film

doi:10.1088/1674-1056/ae6b3d

中国物理B ›› 2026, Vol. 35 ›› Issue (7): 77403-077403.doi: 10.1088/1674-1056/ae6b3d

Superconductivity in monoclinic TiO film

Shihao Liu(刘仕豪)^1,†, Zongyao Huang(黄宗耀)^1,†, Huiyu Wang(王慧宇)¹, Wei Hu(胡卫)², Xiangyu Hua(华翔宇)¹, Zhaohang Li(李朝航)¹, Zhiwei Wang(王智炜)¹, Feixiong Quan(全飞熊)¹, Zhen Wang(王臻)¹, Jing Tao(陶靖)¹, Tao Wu(吴涛)¹, Xigang Luo(罗习刚)¹, and Xianhui Chen(陈仙辉)^1,3,4,‡

1 Department of Physics, University of Science and Technology of China, Hefei 230026, China;
2 Institute of Physics, Chinese Academy of Sciences, Beijing 101499, China;
3 CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China;
4 CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China

收稿日期:2026-04-03 修回日期:2026-05-04 接受日期:2026-05-11 发布日期:2026-07-10
通讯作者: Xianhui Chen E-mail:chenxh@ustc.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 12488201, 12274390 and 12304035), the Anhui Initiative in Quantum Information Technologies (Grant No. AHY160000), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302802), the National Key R&D Program of China (Grant No. 2022YFA1602600), the Basic Research Program of the Chinese Academy of Sciences Based on Major Scientific Infrastructures (Grant No. JZHKYPT-2021-08).

Superconductivity in monoclinic TiO film

1 Department of Physics, University of Science and Technology of China, Hefei 230026, China;
2 Institute of Physics, Chinese Academy of Sciences, Beijing 101499, China;
3 CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China;
4 CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China

Received:2026-04-03 Revised:2026-05-04 Accepted:2026-05-11 Published:2026-07-10
Contact: Xianhui Chen E-mail:chenxh@ustc.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 12488201, 12274390 and 12304035), the Anhui Initiative in Quantum Information Technologies (Grant No. AHY160000), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302802), the National Key R&D Program of China (Grant No. 2022YFA1602600), the Basic Research Program of the Chinese Academy of Sciences Based on Major Scientific Infrastructures (Grant No. JZHKYPT-2021-08).

1. 2026-077403-SI.pdf(2209KB)

摘要/Abstract

摘要： Titanium oxide films garner substantial research attention among binary oxides since the superconducting transition temperature of cubic TiO significantly rises from around 2 K in bulk to 7.4 K in thin films. In this study, titanium oxide thin films were fabricated using magnetron sputtering on Al$_2$O$_3$ substrates, where spatially multiphase coexistence was observed. By incorporating a Gd-doped CeO$_{2}$ (GCO) buffer layer, we achieved the epitaxial growth of single-phase monoclinic TiO thin films, which exhibit a superconducting transition temperature of 5 K. Concurrently, a previously unreported superstructure is identified within the GCO intermediate layer, arising from oxygen vacancy ordering during heteroepitaxial growth. These findings confirm the emergence of superconductivity in the monoclinic titanium oxide system and provide valuable insights into elucidating the relationship between the structures and properties of various titanium oxides, as well as the ion redistribution mechanisms during the synthesis of complex oxide thin films.

关键词: superconductivity, titanium oxide, thin film, cerium dioxide, superlattice, polaron

Abstract: Titanium oxide films garner substantial research attention among binary oxides since the superconducting transition temperature of cubic TiO significantly rises from around 2 K in bulk to 7.4 K in thin films. In this study, titanium oxide thin films were fabricated using magnetron sputtering on Al$_2$O$_3$ substrates, where spatially multiphase coexistence was observed. By incorporating a Gd-doped CeO$_{2}$ (GCO) buffer layer, we achieved the epitaxial growth of single-phase monoclinic TiO thin films, which exhibit a superconducting transition temperature of 5 K. Concurrently, a previously unreported superstructure is identified within the GCO intermediate layer, arising from oxygen vacancy ordering during heteroepitaxial growth. These findings confirm the emergence of superconductivity in the monoclinic titanium oxide system and provide valuable insights into elucidating the relationship between the structures and properties of various titanium oxides, as well as the ion redistribution mechanisms during the synthesis of complex oxide thin films.

Key words: superconductivity, titanium oxide, thin film, cerium dioxide, superlattice, polaron

中图分类号: (Properties of superconductors)

74.25.-q

74.25.F- (Transport properties) 74.78.-w (Superconducting films and low-dimensional structures) 01.50.ff (Films; electronic video devices)

Shihao Liu(刘仕豪), Zongyao Huang(黄宗耀), Huiyu Wang(王慧宇), Wei Hu(胡卫), Xiangyu Hua(华翔宇), Zhaohang Li(李朝航), Zhiwei Wang(王智炜), Feixiong Quan(全飞熊), Zhen Wang(王臻), Jing Tao(陶靖), Tao Wu(吴涛), Xigang Luo(罗习刚), and Xianhui Chen(陈仙辉). Superconductivity in monoclinic TiO film[J]. 中国物理B, 2026, 35(7): 77403-077403.

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Superconductivity in monoclinic TiO film

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