Structurally-driven metal-insulator transition in Ca2Ru 1-xCrxO4 (0≤x<0.14): A single crystal X-ray diffraction study

T. F. Qi, M. Ge, O. B. Korneta, S. Parkin, L. E. De Long, G. Cao

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Correlation between structure and transport properties are investigated in high-quality single-crystals of Ca2Ru1-xCr xO4 with 0<x<0.14 using single crystal X-ray diffraction and by electronic studies. The parent compound was known to exhibit an intriguing first-order structurally driven metalinsulator (MI) transition at 357 K. Upon chromium doping on the ruthenium site, the metalinsulator transition temperature (TMI) was drastically reduced, and is related to the competition between structural changes that occur upon Cr doping and with decreasing temperature. A strong suppression of structural distortions with increasing Cr substitution was identified. No clear TMI can be observed when x>13.5% and the system behaves as an insulator. Such a large, sharp metalinsulator transition and tuneable transition temperature may have potential applications in electronic devices.

Original languageEnglish
Pages (from-to)893-898
Number of pages6
JournalJournal of Solid State Chemistry
Issue number4
StatePublished - Apr 2011

Bibliographical note

Funding Information:
We are thankful to Dr. J.W. Brill for useful discussions. This work was supported by NSF grants DMR-0552267 , DMR-0856234 and EPS-0814194 .


  • Metalinsulator transition
  • Single crystal X-ray diffraction
  • Structurally-driven
  • Structure distortion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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