NEW INSIGHTS INTO THE REENTRY BEHAVIOR OF DEUTERATED DCNQI CU-SALTS BY MICROWAVE MEASUREMENTS

The microwave conductivity of the copper salt of DCNQI (N,N'-Dicyanoqu inodiimine) with two methyl side groups (undeuterated, h(8)), the full y deuterated salt (d(8)), the salt with only the methyl groups deutera ted and of alloys of undeuterated and deuterated salts was measured. T he microwave conductivity (10.2 GHz) qualitatively follows the de cond uctivity. The difference is in the window of diminished conductivity b etween phase transition and reentry, where the microwave conductivity is higher than the de conductivity. This indicates the existence of a crystal fraction with higher (metallic) conductivity (portion: approxi mate to 1 parts per thousand) not seen by dc methods.