Abstract
The organic semiconductor α′-(BEDT-TTF)2BrICl, which exhibits an abrupt decrease of static magnetic susceptivity at Tc (approximately 200 \rm K) with decreasing temperature was investigated by X-ray diffraction experiments. The drastic first-order structural phase transition at Tc was found. The unitcell volume became approximately half of that above Tc. The result of crystal structure analysis at 25 \rm K indicated that the donor molecular arrangement was no longer “α′-type” but “β”-type” below Tc.
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Watanabe, M., Noda, Y. & Taniguchi, H. X-ray Investigation for α′-(BEDT-TTF)2BrICl at Low Temperature. J Low Temp Phys 142, 163–166 (2006). https://doi.org/10.1007/s10909-006-9003-4
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DOI: https://doi.org/10.1007/s10909-006-9003-4