Studies of the transport properties in the layered ϰ-phase ET2Cu[N(CN)2]Hal (Hal= Cl1-xBrx and I) salts 2. Magnetic field effect on the thermopower of Hal= Cl salt

Thermopower S vs temperature dependences were measured for single crystals ET2Cu[N(CN)2]Cl. Magnetic field of 14 T shifts the S(T) curve to high temperatures. This behaviour is ascribed tentatively to the transport by the magnetic polarons (ferrons), the domains around free carriers that appear as ferromagnetically ordered regions in the antiferromagnetically ordered matrix and are stabilized by the magnetic field above the magnetic transition in the material. A peculiar zero value of the S is interpreted as an evidence for a collective motion of these quasiparticles.