Transport and Thermodynamic Properties in Weyl Semimetal and Altermagnet GdAlSi

Altermagnetism (AM) has recently drawn great attention for its novel spin-split band structure despite having zero net magnetization, making it distinct from ferromagnetism (FM) and antiferromagnetism (AFM). Interestingly, some rare-earth intermetallic compounds have been predicted to be Weyl semimetals while also harboring altermagnetic order at the same time. Such material systems are a promising playground to investigate the interplay between band topology and this new type of magnetism. In this talk, we present one of those candidates: GdAlSi.

We present our ongoing work focusing on constructing the Fermi surface anisotropy and studying the details of the magnetic phase transition of GdAlSi. The Fermi surface is studied through resistivity tensor measurements as well as angle-dependent magnetotransport. From this study, we focus on finding consistency between our experimental results and the previous reports, including band structure calculations and ARPES studies. In addition, we discuss our efforts to find signatures of non-trivial topology and altermagnetism via magnetotransport. Lastly, we present our studies detailing the magnetic phase transition at 32 K by comparing our specific heat measurements with our theoretical calculations.