Anomalous Seebeck effect in the vicinity of the magnetic phase transition in
ET2Cu[N(CN)2]CI1-xBrx (
), where it is bis(ethylenedithio)tetrathiafulvalene
Tanatar M. A., Yefanov V. S., Dyakin V. V., Bondarenko V. A., Kushch N. D., Yagubskii E. B.
The temperature dependences of the a axis in-plane resistivity and of the thermopower S along the a and с axes were measured for the single crystals ET2Cu[N(CN)2]Cl,_rBrt (0=£*<0.5). The most interesting feature of the S-vs-T curves is that for both in-plane directions the magnitude of S starts to decrease at nearly 35 К and reaches zero at nearly 20 K. This behavior is related to the magnetic phase transition in the salt and is attributed tentatively to the magnetic polaron formation.