Temperature dependence of the unit cell of (TMTSF)2ReO4through the metal-insulator transition

Single-crystal X-ray measurements show a shearing of the unit cell of (TMTSF)2ReO4 in the ab plane at the 180K metal-insulator transition. The authors report the temperature dependence of the principal coefficients of thermal expansion between 100 and 300K. At room temperature they find values of 46, 5 and -9*10-5 K-1 in the three principal directions, which are similar to those reported for (TMTSF)2PF6.