Delta-temperatural electronic transportation achieved in metastable perovskite rare-earth nickelate thin films

Jikun Chen, Haiyang Hu, Takeaki Yajima, Jiaou Wang, Binghui Ge, Hongliang Dong, Yong Jiang, Nuofu Chen

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

The metal to insulator transition (MIT) in Mott-Hubbard systems is one of the most important discoveries in condensed matter physics, and results in abrupt orbital transitions from insulating to metallic phases by elevating the temperature across a critical point (TMIT). Although the MIT was previously expected to be mainly driven by the orbital Coulomb repulsion energy, the entropy contribution to the orbital free energy, which also determines the relative stability of the metallic and insulating phases, was overlooked. Herein, we demonstrate an additional reversible electronic transition observed in chemically grown thin films of metastable rare-earth nicklate perovskites (ReNiO3) on single crystalline substrates, in addition to their MIT. By elevating the temperature across another critical point (TR-MIT) below TMIT, the resistivity of the ReNiO3/substrate system abruptly increases by 2-3 orders, the transition of which is named reverse temperature-dependence in electrical transportation compared to the metal to insulator transition (denoted herein as the R-MIT) and associated with entropy. TR-MIT is shown to be enhanced via reducing the compositional complexity and size of Re or imparting bi-axial compressive strains, and meanwhile the transition sharpness of delta-temperatural transport is reduced. Combining the afterwards exponentially decreasing resistivity in the insulating phase of ReNiO3 with further temperature elevation, a delta-temperatural transportation character is established. This functionality is potentially useful in locking the working temperature window for electric devices that cater for the demand in the fast developing automatic transmission or artificial intelligence.

本文言語英語
ページ(範囲)8101-8108
ページ数8
ジャーナルJournal of Materials Chemistry C
7
26
DOI
出版ステータス出版済み - 2019
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料化学

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