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Phys. Rev. B 66, 073108 (2002) [4 pages]

Symmetry breaking in the metal-insulator transition of BaVS3

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T. Inami1, K. Ohwada1, H. Kimura2, M. Watanabe2, Y. Noda2, H. Nakamura3, T. Yamasaki3,*, M. Shiga3, N. Ikeda4, and Y. Murakami1,5
1Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Mikazuki, Hyogo 679-5148, Japan
2Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan
3Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan
4Japan Synchrotron Radiation Research Institute, Mikazuki, Hyogo 679-5148, Japan
5Department of Physics, Tohoku University, Sendai 980-8578, Japan

Received 4 March 2002; published 20 August 2002

It has been believed for a long time that the metal-to-insulator (MI) transition of BaVS3 is not accompanied by any spatial order of the spin and lattice. We have carried out x-ray-diffraction measurements of BaVS3 single crystals using a laboratory x-ray source as well as synchrotron radiation, and found that superlattice reflections which double the lattice constant c exist below the transition temperature. The most probable space group at the low-temperature insulator phase contains two inequivalent vanadium sites, and thus a charge disproportionation of the vanadium ions is considered the main cause of the MI transition.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.073108
DOI:
10.1103/PhysRevB.66.073108
PACS:
71.30.+h, 61.10.-i, 71.27.+a

*Present address: Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan

 
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