High electron mobility and large magnetoresistance in the half-Heusler semimetal LuPtBi
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractMaterials with high carrier mobility showing large magnetoresistance (MR) have recently received much attention because of potential applications in future high-performance magnetoelectric devices. Here, we report on an electron-hole-compensated half-Heusler semimetal LuPtBi that exhibits an extremely high electron mobility of up to 79000cm2/Vs with a nonsaturating positive MR as large as 3200% at 2 K. Remarkably, the mobility at 300 K is found to exceed 10500cm2/Vs, which is among the highest values reported in three-dimensional bulk materials thus far. The clean Shubnikov–de Haas quantum oscillation observed at low temperatures and the first-principles calculations together indicate that the high electron mobility is due to a rather small effective carrier mass caused by the distinctive band structure of the crystal. Our findings provide a different approach for finding large, high-mobility MR materials by designing an appropriate Fermi surface topology starting from simple electron-hole-compensated semimetals.
CitationHigh electron mobility and large magnetoresistance in the half-Heusler semimetal LuPtBi 2015, 92 (23) Physical Review B
PublisherAmerican Physical Society (APS)
JournalPhysical Review B