Fig. 2: Nernst effect in doped PBTTT at 300 K.
From: Observation of anomalously large Nernst effects in conducting polymers
a Schematic diagram and (b) photograph of the PBTTT Nernst device. The Seebeck (\({V}_{x}\)) and Nernst (\({V}_{y}\)) effects were measured in-situ simultaneously with an in-plane temperature gradient \(\nabla T\) established by the Au heater. An out-of-plane magnetic field \({B}_{z}\) is applied for the Nernst effect measurements, in which the presented direction is defined as positive. The plus and minus signs on the electrodes denote the wiring setup of the Nernst signal measurements. The film aspect ratio is set by \({L}_{x}/{L}_{y}=4.5\). c Measured transverse Nernst voltage signal \({V}_{y}\) versus magnetic field under different temperature gradients in an 80 mmol L−1 FeCl3-doped PBTTT film. d Extracted Seebeck (red line) and Nernst (blue line) voltage signals when \(B=9{{\rm{T}}}\) versus different applied temperature gradients. e Measured Nernst coefficient versus the angle θ between the rotating temperature gradient (\(\Delta T=4{{\rm{K}}}\)) and the perpendicular magnetic field (\(B=-9{{\rm{T}}}\) and \(9{{\rm{T}}}\)), as the device is rotated in the xz plane while the magnetic field is fixed in the z-direction. The dashed black curve plots the Sine function according to the Lorentz force. Error bars were determined from uncertainty in the extraction of electromotive force and represent one standard deviation. Source data are provided as a Source Data file.
