Abstract
The conductivity of single crystals of the organic conductor (ET)4Hg3I8 [ET-bis(ethylendithio)tetrathiafulvalene] has been investigated at temperatures from 4.2 to 360 K and pressures of up to 75 kbar. Two first-order phase transitions have been detected at room temperature at pressures of 2.75 and 6.7 kbar. On the basis of the experimental data, the p-Tphase diagram for the first-order phase transitions has been plotted. The unusual shape of the phase diagram (a slow monotonic growth of the transition temperature with a slope dT/dp=4 deg/kbar followed by a sharp drop around the point p 0=6.5 kbar, T 0=324 K) has been analyzed using the Landau theory of second-order phase transitions. Our analysis supports the hypothesis of a second-order phase transition around this point and also exhibits satisfactory agreement between calculations and the experimental curves of the first-order phase transitions.
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Zh. Éksp. Teor. Fiz. 115, 2190–2196 (June 1999)
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Kornilov, A.V., Pudalov, V.M., Kochkin, A.P. et al. Behavior of the p-T phase diagram of the organic conductor (ET)4Hg3I8 . J. Exp. Theor. Phys. 88, 1198–1201 (1999). https://doi.org/10.1134/1.558910
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DOI: https://doi.org/10.1134/1.558910