Anomalous Seebeck effect in the vicinity of the magnetic phase transition in ET2Cu[N(CN)_2]Cl1-xBrx (0 < x < 0.5), where it is bis(ethylenedithio)tetrathiafulvalene
Tanatar M.A., Yefanov V.S., Dyakin V.V., Bondarenko V.A., Kushch N.D., Yagubskii E.B.
Temperature dependencies of the α axis in plane resistivity as well as of the thermopower, 5, along the α and с axes were measured for single crystals ET2Cu[N(CN)2]Cl|_xBrx (0 < χ < 0.5). The most interesting feature of the S vs Τ curves is that for both in plane directions the magnitude of 5 starts to decrease at nearly 35 К and reaches zero at nearly 20 K. This behavior is related with the magnetic phase transition in the salt and is ascribed tentatively to the magnetic polar on formation.