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. 2016 Dec 9;7:13552. doi: 10.1038/ncomms13552

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Copyright © 2016, The Author(s)

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(a) Crystal structures of 1T′ (shadow) and T_d (solid) phases. (b) Resistivity measurement shows a temperature-induced phase transition. The inset shows a photograph of the high-quality single crystal; scale bar, 5 mm. (c) Raman spectra at 320 and 80 K. The letters inside the parenthesis indicate the polarization directions for incident and scattering lights.