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that the randomness of the ferroelectric polarizations
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and leads to the anomalous temperature dependence of thesteepness parameter of the Urbach tail.
References ==KDQJ)6HNLJXFKL70RUL\DPD6&)XUX\D06DWR76DWRK<0XNDL.7DQDND7<DPDPRWR+.DJH\DPD<.DQHPLWVXDQG++LURULNature Commun. 14   .&KR7<DPDGD06DUX\DPD56DWR77HUDQLVKLDQG<.DQHPLWVX
J. Chem. Phys. 158   &+LJDVKLPXUD*<XPRWR7<DPDGD71DNDPXUD)+DUDWD++LURUL$:DNDPL\DDQG<.DQHPLWVXJ. Phys. Chem. Lett. 14
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