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

TitleRobust tunability of magnetoresistance in half-Heusler RPtBi (R = Gd, Dy, Tm, and Lu) compounds
Publication TypeJournal Article
Year of Publication2016
AuthorsMun, E, Bud'ko, SL, Canfield, PC
JournalPhysical Review B
Date Published03
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000372715000002
Keywordscebipt, dependent fermi-surface, giant, linear magnetoresistance, magnetoresistance, magnetothermopower, physics, quantum, transport-properties

We present the magnetic field dependencies of transport properties for RPtBi (R = Gd, Dy, Tm, and Lu) half-Heusler compounds. Temperature- and field-dependent resistivity measurements of high-quality RPtBi single crystals reveal an unusually large, nonsaturating 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 similar to 100 mu V/K at 140 kOe. Analysis of the transport data in this series reveals that the rare-earth-based half-Heusler compounds provide opportunities to tune MR effect through lanthanide contraction and to elucidate the mechanism of nontrivial MR.

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Complex States

Alternate JournalPhys. Rev. B