Magnetic and transport properties of rare-earth-based half-Heusler phases RPdBi: prospective systems for topological quantum phenomena

TL;DR

This study investigates the magnetic, electronic, and thermoelectric properties of RPdBi compounds, revealing their potential for topological quantum phenomena due to complex electronic structures and favorable thermoelectric performance.

Contribution

It provides comprehensive experimental characterization of RPdBi compounds, highlighting their complex electronic structures and potential for topological quantum applications.

Findings

RPdBi compounds exhibit localized magnetism and antiferromagnetic order at low temperatures.

Transport measurements indicate semimetal or narrow-band semiconductor behavior.

DyPdBi shows excellent thermoelectric properties with high power factor.

Abstract

RPdBi (R = Er, Ho, Gd, Dy, Y, Nd) compounds were studied by means of x-ray diffraction, magnetic susceptibility, electrical resistivity, magnetoresistivity, thermoelectric power and Hall effect measurements, performed in the temperature range 1.5-300 K and in magnetic fields up to 12 T. These ternaries, except diamagnetic YPdBi, exhibit localized magnetism of $R^{3+}$ ions, and order antiferromagnetically at low temperatures ($T_{N}$ = 2-13 K). The transport measurements revealed behavior characteristic of semimetals or narrow-band semiconductors. Both, electrons and holes contribute to the conductivity with dominant role of p-type carriers. The Hall effect of ErPdBi is strongly temperature and magnetic field dependent, reflecting complex character of the underlying electronic structures with multiple electron and hole bands. RPdBi, and especially DyPdBi, exhibit very good thermoelectric properties with a power factor coefficient $PF$ ranging from 6 to 20 $\mu$Wcm$^{-1}$K$^{-2}$.