Jump to main content
Jump to site search

Issue 20, 2017
Previous Article Next Article

Opposite pressure effects in the orbitally-induced Peierls phase transition systems CuIr2S4 and MgTi2O4

Author affiliations

Abstract

The iso-spinel structural systems CuIr2S4 and MgTi2O4 exhibit phase transitions of a similar nature at ∼230 K and ∼260 K respectively, which are explained as an orbitally-induced Peierls phase transition. However, in this work, we uncover that the applied pressure has opposite pressure effects on the phase transitions in CuIr2S4 and MgTi2O4. As the pressure increases, the phase transition temperature (TMI) for CuIr2S4 increases while that for MgTi2O4 decreases. In addition, the phase transition intensity becomes weaker for CuIr2S4 but gets stronger for MgTi2O4 under pressure. Our results indicate that the applied pressure suppresses the metallic phase in CuIr2S4, while enhances that in MgTi2O4. Combining the experimental observations with first-principles electronic structure calculations, we suggest that the opposite pressure effects in CuIr2S4 and MgTi2O4 originate from the different orbital ordering configurations (dxy, dyz/dxz) caused by different lattice distortions in these two systems. Our findings indicate directly that the interplay between the orbital and lattice degrees of freedom plays an important role in the orbitally-induced Peierls phase transition.

Graphical abstract: Opposite pressure effects in the orbitally-induced Peierls phase transition systems CuIr2S4 and MgTi2O4

Back to tab navigation

Supplementary files

Publication details

The article was received on 13 Feb 2017, accepted on 23 Apr 2017 and first published on 25 Apr 2017


Article type: Paper
DOI: 10.1039/C7DT00527J
Citation: Dalton Trans., 2017,46, 6708-6714
  •   Request permissions

    Opposite pressure effects in the orbitally-induced Peierls phase transition systems CuIr2S4 and MgTi2O4

    L. Ma, H. Han, W. Liu, K. Yang, Y. Zhu, C. Zhang, L. Pi, D. Liu, L. Zhang and Y. Zhang, Dalton Trans., 2017, 46, 6708
    DOI: 10.1039/C7DT00527J

Search articles by author

Spotlight

Advertisements