Quantum oscillations and transport properties of layered single-crystal SrCu4As2
Abstract
We report a systematic investigation of the physical properties and Fermi-surface topology of layered single-crystal 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 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 SrCu4As2, as suggested by the band structure calculations.
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