Phase control of strongly correlated organic conductor

The kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br salts were synthesized from nondeuter ated, partially, and fully deuterated BEDT-TTF molecules. The electrical re sistance of these salts was examined systematically as functions of tempera ture and cooling rate, and found to change from metallic to insulating beha viors by the progressive deuterations and increasing the cooling rate. This means the active control of. the correlation effect of electrons in this f amily. (C) 2000 Elsevier Science B.V. All rights reserved.