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Pressure-Temperature Phase Diagram of $(TMTSF)_2BF_4$  

Jo, Y.J. (Department of Physics, Kyungpook National University)
Publication Information
Progress in Superconductivity / v.14, no.1, 2012 , pp. 24-29 More about this Journal
Abstract
$(TMTSF)_2BF_4$ containing non-centrosymmetric anions is well known to exhibit a metal insulator transition around 37 K by ordering of the anions with a $q_2$=(1/2, 1/2, 1/2) wave vector. We established pressure-temperature phase diagram of the $(TMTSF)_2BF_4$ compound and showed that it can belong to the general phase diagram of the $(TMTSF)_2X$ family. Application of hydrostatic pressure decreases the anion ordering transition temperature and the superconducting state is finally stabilized below 3.77 K under 7.7 kbar. Magnetoresistance measurement on the $(TMTSF)_2BF_4$ under 7.8 kbar is performed but neither the field-induced spin-density-wave state nor the rapid oscillation is observed up to 9 T.
Keywords
TMTSF; organic superconductor; pressure; phase diagram; anion ordering;
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