Pressure-temperature phase diagram of (DMDCNQI)2Ag: A comparative study with related compounds

R. T. Henriques, S. Tomic, W. Kang, D. Jérôme, F. Brisset, P. Batail, P. Erk, S. Hünig, J. U.von Schütz

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The pressure-temperature phase diagram of the silver salt of the 2,5- dimethylcicyanoquinonediimine, (DMDCNQI)2Ag, is established by electrical resistivity measurements. In it are included the temperatures of resistivity minima (Tρ{variant}) and of the transition defined by the anomaly in the logarithmic derivative of the resistivity. Correlating the present data with the information from X-ray diffuse scattering and magnetic susceptibility, it is concluded that the low temperature insulating state has a spin-Peierls character. Other important feature of this material is a transition towards a more conductive state upon applying pressure of 10.4 kbar, at ambient temperature. The distinct behaviour of (DMDCNQI)2Ag (abbreviated DM-Ag) relative to the Cu analog (DM-Cu) and (CIM-DCNQI)2Cu (CM-Cu) is also discussed.

Original languageEnglish
Pages (from-to)333-338
Number of pages6
JournalSynthetic Metals
Issue number3-4
StatePublished - 30 Dec 1988


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