Observation of superconductivity in structure-selected Ti2O3 thin films

Yangyang Li, Yakui Weng, Junjie Zhang, Junfeng Ding, Yihan Zhu, Qingxiao Wang, Yang Yang, Yingchun Cheng, Qiang Zhang, Peng Li, Jiadan Lin, Wei Chen, Yu Han, Xixiang Zhang, Lang Chen, Xi Chen, Jingsheng Chen, Shuai Dong, Xianhui Chen, Tom Wu

Research output: Contribution to journalArticle

Abstract

The search for new superconductors capable of carrying loss-free current has been a research theme in condensed matter physics for the past decade. Among superconducting compounds, titanates have not been pursued as much as Cu2+ (3d9) (cuprate) and Fe2+ (3d6) (pnictide) compounds. Particularly, Ti3+-based compounds or electron systems with a special 3d1 filling are thought to be promising candidates as high-TC superconductors, but there has been no report on such pure Ti3+-based superconducting titanates. With the advent of thin-film growth technology, stabilizing new structural phases in single-crystalline thin films is a promising strategy to realize physical properties that are absent in the bulk counterparts. Herein, we report the discovery of unexpected superconductivity in orthorhombic-structured thin films of Ti2O3, a 3d1 electron system, which is in strong contrast to the conventional semiconducting corundum-structured Ti2O3. This is the first report of superconductivity in a titanate with a pure 3d1 electron configuration. Superconductivity at 8 K was observed in the orthorhombic Ti2O3 films. Leveraging the strong structure-property correlation in transition-metal oxides, our discovery introduces a previously unrecognized route for inducing emergent superconductivity in a newly stabilized polymorph phase in epitaxial thin films.

Original languageEnglish (US)
Pages (from-to)522-532
Number of pages11
JournalNPG Asia Materials
Volume10
Issue number6
DOIs
StatePublished - Jun 1 2018

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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    Li, Y., Weng, Y., Zhang, J., Ding, J., Zhu, Y., Wang, Q., Yang, Y., Cheng, Y., Zhang, Q., Li, P., Lin, J., Chen, W., Han, Y., Zhang, X., Chen, L., Chen, X., Chen, J., Dong, S., Chen, X., & Wu, T. (2018). Observation of superconductivity in structure-selected Ti2O3 thin films. NPG Asia Materials, 10(6), 522-532. https://doi.org/10.1038/s41427-018-0050-5