Spin-lattice relaxation phenomena in the magnetic state of a suggested Weyl semimetal CeAlGe

TL;DR

This study investigates the magnetic and spin-lattice relaxation phenomena in CeAlGe, a proposed Weyl semimetal, revealing complex magnetic ordering, spin-orbit interactions, and anomalous magnetoresistance effects.

Contribution

It provides new insights into spin-lattice relaxation and spin-orbit interactions in CeAlGe, a candidate Weyl semimetal, through comprehensive experimental analysis.

Findings

Antiferromagnetic ordering at 5.2 K

Presence of spin-lattice relaxation phenomena

Evidence of Rashba-Dresselhaus spin-orbit interaction

Abstract

In this work we report the results of DC susceptibility, AC susceptibility and related technique, resistivity, transverse and longitudinal magnetoresistance and heat capacity on polycrystalline magnetic semimetal CeAlGe. This compound undergoes antiferromagnetic type ordering around 5.2 K (T1). Under application of external magnetic fields, parallel alignment of magnetic moments is favored, above 0.5 Tesla. At low field and temperature, frequency and AC field amplitude response of AC susceptibility indicate to the presence of spin-lattice relaxation phenomena. The observation of spin-lattice interaction suggests to the presence of Rashba-Dresselhaus spin-orbit interaction which is associated with inversion and time reversal symmetry breaking. Additionally, presence of negative and asymmetric longitudinal magnetoresistance indicates anomalous velocity contribution to the magnetoresistance due to Rashba-Dresselhaus spin-orbit interaction which is further studied by heat capacity.