Observation of insulating-insulating monoclinic structural transition in macro-sized VO2 single crystals

Bongjin Simon Mun, Kai Chen, Youngchul Leem, Catherine Dejoie, Nobumichi Tamura, Martin Kunz, Zhi Liu, Michael E. Grass, Changwoo Park, Joonseok Yoon, Y. Yvette Lee, Honglyoul Ju

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21 Citations (Scopus)

Abstract

VO2 single crystals with unprecedented quality, exhibiting a first-order metal-insulator transition (MIT) at 67.8 °C and an insulator -insulator transition (IIT) at ∼49 °C, are grown using a self-flux evaporation method. Using synchrotron-based X-ray microdiffraction analysis, it is shown that the IIT is related to a structural phase transition (SPT) from the monoclinic M2 phase to the M1 phase upon heating while the MIT occurs together with a SPT of M1 to the rutile R phase. All previous reports have shown that VO2 exists in the M1 phase at room temperature in contrast to the M2 phase observed in this work. We suggest that internal strain inside single crystal VO2 may generate the previously unobserved IIT and the unusual room temperature structure. (

Original languageEnglish
Pages (from-to)107-109
Number of pages3
JournalPhysica Status Solidi - Rapid Research Letters
Volume5
Issue number3
DOIs
Publication statusPublished - 2011 Mar 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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    Mun, B. S., Chen, K., Leem, Y., Dejoie, C., Tamura, N., Kunz, M., Liu, Z., Grass, M. E., Park, C., Yoon, J., Lee, Y. Y., & Ju, H. (2011). Observation of insulating-insulating monoclinic structural transition in macro-sized VO2 single crystals. Physica Status Solidi - Rapid Research Letters, 5(3), 107-109. https://doi.org/10.1002/pssr.201105011