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We describe an AC method for the measurement of the longitudinal (Sxx) andtransverse (Sxy, i.e. Nernst) thermopower of mm-size single crystal samples atlow temperatures (T<1 K) and high magnetic fields (B>30 T). A low-frequency (33mHz) heating method is used to increase the resolution, and to determine thetemperature gradient reliably in high magnetic fields. Samples are mountedbetween two thermal blocks which are heated by a sinusoidal frequency f0 with ap/2 phase difference. The phase difference between two heater currents gives atemperature gradient at 2f0. The corresponding thermopower and Nernst effectsignals are extracted by using a digital signal processing method due. Animportant component of the method involves a superconducting link, YBa2Cu3O7+d(YBCO), which is mounted in parallel with sample to remove the backgroundmagnetothermopower of the lead wires. The method is demonstrated for the quasitwo-dimensional organic conductor a-(BEDT-TTF)2KHg(SCN)4, which exhibits acomplex, magnetic field dependent ground state above 22.5 T at lowtemperatures.Comment: 11 pages, 6 figures, 15 reference

Low-frequency method for magnetothermopower and Nernst effect measurements on single crystal samples at low temperatures and high magnetic fields