Hall effect in organic conductor (ET)/sub 2/TlHg(SCN)/sub 4/

Summary form only given. The temperature dependence of Hall constant has been studied in the organic quasi - two dimensional conductor (ET)/sub 2/TlHg(SCN)/sub 4/ in interval 1.8 - 20K. The sign of Hall constant corresponds to holes in this temperature area. At temperature decreasing from 12K up to 5K Hall voltage rapidly increases approximately 20 times. Such behaviour is connected with the phase transition in SDW state. But quantitive change of Hall constant is not in agreement with the zone structure calculations.