Significant Anomalous Hall Coefficients Observed in Magnetic Weyl Semimetal and Prospective Candidate RAlSi

Equiatomic light-rare-earth-based RAlSi Weyl semimetals have been synthesized, forming single crystals with a noncentrosymmetric LaPtSi-type structure. In contrast to the nonmagnetic LaAlSi, the behavior of CeAlSi and PrAlSi is strongly influenced by localized 4f electrons. PrAlSi exhibits collinear ferromagnetic order, whereas for CeAlSi, the crystal-electric-field effect becomes more pronounced. The critical magnetic ordering temperatures (Tcs) for CeAlSi and PrAlSi are approximately 11.6 K and 18.1 K, respectively. A simple method is introduced to determine anomalous Hall coefficients reliably, yielding maximum values of 0.027 cm3/C for CeAlSi and 0.100 cmsup>3/C for PrAlSi, primarily governed by skew scattering as an extrinsic mechanism rather than intrinsic topology. This method mitigates the inaccuracies arising from artificially excluding anomalous components in the Hall resistivity. The study offers valuable insights into the transport characteristics of the Weyl RAlSi family, highlighting their potential applications in spintronics and quantum computing.