Transport coefficients of InSb in a strong magnetic field

Abstract

Improvement of a superconducting magnet system makes induction of a strong magnetic field easier. This fact gives us a possibility of energy conversion by the Nernst effect. As the first step to study the Nernst element, we measured the conductivity, the Hall coefficient, the thermoelectric power and the Nernst coefficient of the InSb, which is one of candidates of the Nernst elements. From this experiment, it is concluded that the Nernst coefficient is smaller than the theoretical values. On the other hand, the conductivity, the Hall coefficient ant the thermoelectric power has the values expected by the theory.

Prototype fabrication and performance evaluation of a thermoelectric module operating with the Nernst effect

“…Its origin is the extraordinarily high mobility of electrons and low Fermi energy (Behnia, 2009). In addition, a large Nernst coefficient has also been reported using other high-carrier mobility materials such as InSb (À82 mV K À1 T À1 at 283 K) (Nakamura et al, 1997), Ge (320 mV K À1 T À1 at 360 K) (Mette et al, 1959), and Cd 3 As 2 (107 mV K À1 T À1 at 250 K) (Xiang et al, 2020). However, a thermoelectric module using these materials operating with the Nernst effect has not been reported.…”

Physical model of Nernst element

“…The conductivity and the Hall coefficient are measured by the van der Pauw method. The thermoelectric power and the Nernst coefficient are also measured for the bridge shaped sample [8]. In Fig.…”

“…effective masses, energy levels, concentrations of impurities, mobilities, energy gap. From the previous works [8], we can get the following parameters:…”