We report a systematic investigation of the physical properties and Fermi-surface topology of layered single-crystal \ce{SrCu4As2} using electrical transport, magnetotransport, and quantum-oscillation experiments plus band-structure calculations. The temperature-dependent electrical resistivity reveals a hysteretic phase transition at TP = 59 K, most likely associated with a structural change. Hall resistivity data suggest a marked change in the average hole density resulting from the latter phase transition near TP. A large, linear, and nonsaturating magnetoresistance is observed at low temperatures in \ce{SrCu4As2}, likely attributable to the multipocket Fermi surface. Quantum-oscillation data measured in magnetic fields of up to 60 T show several oscillation frequencies exhibiting low effective masses, indicating the presence of Dirac-like band dispersion in \ce{SrCu4As2}, as suggested by the band structure calculations.
@article{arxiv.2510.14774,
title = {Quantum oscillations and transport properties of layered single-crystal SrCu$_4$As$_2$},
author = {Sudip Malick and Michał J. Winiarski and Joanna Bławat and Hanna Świątek and John Singleton and Tomasz Klimczuk},
journal= {arXiv preprint arXiv:2510.14774},
year = {2025}
}