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

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 (T 1 ). 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.

How to identify and characterize strongly correlated topological semimetals

“…216) [53], the tetragonal compound CeAlGe (SG I4 1 md, No. 109) [54][55][56], and the cubic compound Ce 3 Rh 4 Sn 13 (SG I2 1 3, No. 199) [57,58], in panels A-D, respectively.…”

Correlation between Slanted Magnetic Structure and Electromagnetic Responses in the RAlGe (R = Tb and Er) System

“…The type-II Weyl nodes dominate the low-energy Berry curvature physics, which shows many topological phenomena such as the negative longitudinal magnetoresistances and the nonlocal transport induced by the chiral anomaly . CeAlGe displays unique magnetic and electric properties such as easy- a- axis antiferromagnetism (AFM) below 5 K, , soft ferromagnetism (FM) with Curie temperature T c = 5.6 K, singular angular magnetoresistance (SAMR), spin–lattice relaxation phenomena, and negative and asymmetric longitudinal magnetoresistances . PrAlGe exhibits strong Ising-type magnetic anisotropy with easy c -axis ferromagnetism and a spin-glass-like transition below 16 K, and a large anomalous Hall effect with holelike carriers is also observed with the increase of bulk Berry curvature fields. − NdAlGe presents the spin-glass-like behavior at 9.2 K and follows Van Vleck paramagnetism (PM) in the paramagnetic region .…”

Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal

“…The magnetic structure of the RAlX family is easy to regulate and presents diverse magnetic ordering. For example, the magnetic structure of RAlX can be nonmagnetic [64][65][66] , ferromagnetic [38][39][40][41][42][43][44][45][46][47][48][49] , antiferromagnetic [49][50][51][52][53][54][55][56] , ferrimagnetic [57][58][59][60] and even spiral magnetic 57,61 by rare earth element substitution. Above the magnetic transition temperature, the RAlX family are already an IS broken Weyl semimetal.…”