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Title: Insulator-metal transitions in the T phase Cr-doped and M 1 phase undoped VO 2 thin films

Abstract

$${\mathrm{VO}}_{2}$$ exhibits several insulating phases (monoclinic $M1,M2$, and triclinic $T)$, and the study of these phases is important for understanding the true nature of the insulator-to-metal transition (IMT) in $${\mathrm{VO}}_{2}$$. These insulating phases have small but discernible crystallographic differences in the vanadium chains forming the dimers. Peculiarities of the electron localizations in the dimerized chains for many of the probes such as NMR make it difficult to characterize the true character of these phases [T. J. Huffman et al., Phys. Rev. B 95, 075125 (2017); J. Pouget et al., Phys. Rev. B 10, 1801 (1974)]. We present structural, electrical, ultrafast-reflectivity, and electronic structure studies of the $T$ phase Cr-doped $${\mathrm{VO}}_{2}$$ and the $M1$ phase pure $${\mathrm{VO}}_{2}$$ thin films, both grown by pulsed laser deposition under identical conditions. An intermediate $M2$ structure is observed in the Cr-doped $${\mathrm{VO}}_{2}$$, while the pure $${\mathrm{VO}}_{2}$$ directly goes from the insulating monoclinic $M1$ structure to a metallic rutile $R$ structure, manifested by temperature-dependent Raman spectroscopy. Temperature-dependent electronic structure studies utilizing x-ray near-edge absorption spectroscopy reveal that all these insulating phases (monoclinic $M1$ and $M2$ and triclinic $T)$ have similar electronic structures which place these insulating phases into the list of Mott-Hubbard insulators. This is a first combined experimental report on the electronic structure of all the three insulating phases, monoclinic $M1,M2$, and triclinic $T$.

Authors:
 [1];  [2];  [1];  [3];  [2];  [1];  [4];  [2];  [2];  [5]
  1. Aligarh Muslim Univ., Aligarh (India). Dept. of Physics
  2. UGC-DAE Consortium for Scientific Research, Indore (India)
  3. Raja Ramanna Centre for Advanced Technology, Indore (India). Nano Science Lab. Materials Science Division
  4. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  5. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); UGC-DAE Consortium for Scientific Research, Indore (India)
Sponsoring Org.:
USDOE; Dept. of Science and Technology (DST) (India); Science and Engineering Research Board (SERB) (India)
OSTI Identifier:
1493920
Grant/Contract Number:  
AC02-06CH11357; ECR/2017/000712
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; phase transitions; Raman spectroscopy; time-resolved reflection spectroscopy; X-ray absorption near-edge spectroscopy

Citation Formats

Majid, S. S., Shukla, D. K., Rahman, F., Khan, S., Gautam, K., Ahad, A., Francoual, S., Choudhary, R. J., Sathe, V. G., and Strempfer, J. Insulator-metal transitions in the T phase Cr-doped and M1 phase undoped VO2 thin films. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.075152.
Majid, S. S., Shukla, D. K., Rahman, F., Khan, S., Gautam, K., Ahad, A., Francoual, S., Choudhary, R. J., Sathe, V. G., & Strempfer, J. Insulator-metal transitions in the T phase Cr-doped and M1 phase undoped VO2 thin films. United States. doi:10.1103/PhysRevB.98.075152.
Majid, S. S., Shukla, D. K., Rahman, F., Khan, S., Gautam, K., Ahad, A., Francoual, S., Choudhary, R. J., Sathe, V. G., and Strempfer, J. Tue . "Insulator-metal transitions in the T phase Cr-doped and M1 phase undoped VO2 thin films". United States. doi:10.1103/PhysRevB.98.075152. https://www.osti.gov/servlets/purl/1493920.
@article{osti_1493920,
title = {Insulator-metal transitions in the T phase Cr-doped and M1 phase undoped VO2 thin films},
author = {Majid, S. S. and Shukla, D. K. and Rahman, F. and Khan, S. and Gautam, K. and Ahad, A. and Francoual, S. and Choudhary, R. J. and Sathe, V. G. and Strempfer, J.},
abstractNote = {${\mathrm{VO}}_{2}$ exhibits several insulating phases (monoclinic $M1,M2$, and triclinic $T)$, and the study of these phases is important for understanding the true nature of the insulator-to-metal transition (IMT) in ${\mathrm{VO}}_{2}$. These insulating phases have small but discernible crystallographic differences in the vanadium chains forming the dimers. Peculiarities of the electron localizations in the dimerized chains for many of the probes such as NMR make it difficult to characterize the true character of these phases [T. J. Huffman et al., Phys. Rev. B 95, 075125 (2017); J. Pouget et al., Phys. Rev. B 10, 1801 (1974)]. We present structural, electrical, ultrafast-reflectivity, and electronic structure studies of the $T$ phase Cr-doped ${\mathrm{VO}}_{2}$ and the $M1$ phase pure ${\mathrm{VO}}_{2}$ thin films, both grown by pulsed laser deposition under identical conditions. An intermediate $M2$ structure is observed in the Cr-doped ${\mathrm{VO}}_{2}$, while the pure ${\mathrm{VO}}_{2}$ directly goes from the insulating monoclinic $M1$ structure to a metallic rutile $R$ structure, manifested by temperature-dependent Raman spectroscopy. Temperature-dependent electronic structure studies utilizing x-ray near-edge absorption spectroscopy reveal that all these insulating phases (monoclinic $M1$ and $M2$ and triclinic $T)$ have similar electronic structures which place these insulating phases into the list of Mott-Hubbard insulators. This is a first combined experimental report on the electronic structure of all the three insulating phases, monoclinic $M1,M2$, and triclinic $T$.},
doi = {10.1103/PhysRevB.98.075152},
journal = {Physical Review B},
number = 7,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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Works referenced in this record:

Metal-insulator transitions
journal, October 1998

  • Imada, Masatoshi; Fujimori, Atsushi; Tokura, Yoshinori
  • Reviews of Modern Physics, Vol. 70, Issue 4, p. 1039-1263
  • DOI: 10.1103/RevModPhys.70.1039

Metal-insulator transition in vanadium dioxide
journal, June 1975