Research Meeting

• Adrian Del Maestro (University of Tennessee, Knoxville)

Room: 321

Neutron Diffraction and Magnetotransport Studies of the Candidate Weyl Semimetal CeGaGe Room: 147 The RXZ (R = rare-earth, X = Al or Ga, Z = Si or Ge) family of materials is thought to crystallize with symmetry described by the noncentrosymmetric I4₁md space group. The band structure of many members predicts Weyl semimetal behavior with topologically protected surface states. When the rare-earth ions carry a magnetic moment, these materials can also exhibit magnetic order, allowing Weyl states above the ordering temperature and enabling studies of the interplay between Weyl quasiparticles and magnetic excitations below it [1, for example]. The compound CeGaGe belongs to this family. Depending on crystal growth conditions, we find that samples can undergo a subtle structural transition to another noncentrosymmetric structure, with symmetry described by space group P4₁, at temperatures above about 100 K [2]. Regardless of low-temperature structure, all samples show a clear transition to a magnetically ordered state at Tc = 5.5 K [2,3]. I will present neutron diffraction results characterizing the crystal and magnetic structures of CeGaGe with varying stoichiometry, along with magnetotransport measurements that may reflect the topological nature of its electronic states. [1] G. Chang et al, Phys. Rev. B 97, 041104 (2018). [2] L. Scanlon et al., Phys. Rev. B 111, 184102 (2025) [3] D. Ram,  et al, Phys. Rev. B 108, 024428 (2023).

Research Meeting

• Jian Liu (University of Tennessee)

Room: 239

Research Meeting

• Yishu Wang (University of Tennessee Knoxville)

Room: 312

Research Meeting

• Joon Sue Lee (University of Tennessee, Knoxville)

Room: 254

Research Meeting

• Hatem Barghathi (University of Tennessee, Knoxville)

Room: 205

Research Meeting

• Wonhee Ko (University of Tennessee, Knoxville)

Room: 233

Research meeting

• Jonathan D'Emidio

Room: 260

Research Meeting

• Rahul Soni (University of Tennessee-Knoxville)

Room: G001 https://tennessee.zoom.us/j/89841955187?pwd=uMbu5zumknSxoVqsSD7qw8jjA1Glaf.1