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. 2017 Feb 16;8:14408. doi: 10.1038/ncomms14408

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Copyright © 2017, The Author(s)

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Optical conductivity spectra of Ta₂NiSe₅ single crystal at various temperatures, showing the opening of a charge excitation gap associated with the transition at T_C=326 K. The gap of E_op≈0.16 eV is estimated from the usual extrapolation of the linear regime of conductivity (black dashed line). The electric polarization was parallel to the a axis.