Robust tunability of magnetorestance in Half-Heusler RPtBi (R = Gd, Dy, Tm, and Lu) compounds

Abstract

We present the magnetic field dependencies of transport properties for $R$PtBi ($R$ = Gd, Dy, Tm, and Lu) half-Heusler compounds. Temperature and field dependent resistivity measurements of high quality $R$PtBi single crystals reveal an unusually large, non-saturating magnetoresistance (MR) up to 300 K under a moderate magnetic field of $H$ = 140 kOe. At 300 K, the large MR effect decreases as the rare-earth is traversed from Gd to Lu and the magnetic field dependence of MR shows a deviation from the conventional $H^2$ behavior. The Hall coefficient ($R_H$) for $R$ = Gd indicates a sign change around 120 K, whereas $R_H$ curves for $R$ = Dy, Tm, and Lu remain positive for all measured temperatures. At 300 K, the Hall resistivity reveals a deviation from the linear field dependence for all compounds. Thermoelectric power measurements on this family show strong temperature and magnetic field dependencies which are consistent with resistivity measurements. A highly enhanced thermoelectric power under applied magnetic field is observed as high as $\sim$100 $\mu$V/K at 140 kOe. Analysis of the transport data in this series reveals that the rare-earth-based Half-Husler compounds provide opportunities to tune MR effect through lanthanide contraction and to elucidate the mechanism of non-trivial MR.

References in corpus (9)

• Titanic Magnetoresistance in WTe2
• Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Half-Heusler Compounds as a New Class of Three-Dimensional Topological Insulators
• Anisotropic giant magnetoresistance in NbSb2
• Metallic surface electronic state in half-Heusler compounds RPtBi (R = Lu, Dy, Gd)
• Magnetic and transport properties of rare-earth-based half-Heusler phases RPdBi: prospective systems for topological quantum phenomena
• Magnetic field tuned quantum criticality of heavy fermion system YbPtBi
• Fabrication and characterization of the gapless half-Heusler YPtSb thin films

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• Stripe Helical Magnetism and Two Regimes of Anomalous Hall Effect in NdAlGe
• Anomalous Transport Properties of Re${}_3$Ge${}_7$
• Tuning of anomalous magnetotransport properties in half-Heusler topological semimetal GdPtBi
• Transverse and Longitudinal Magnetothermopower Promoted by Ambipolar Effect in Half-Heusler Topological Materials