Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

3-15-2016

Journal or Book Title

Physical Review B

Volume

93

Issue

11

First Page

115134

DOI

10.1103/PhysRevB.93.115134

Abstract

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 H2 behavior. The Hall coefficient (RH) for R=Gd indicates a sign change around 120 K, whereas RH 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 ∼100 μV/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.

Comments

This article is published as Mun, Eundeok, Sergey L. Bud'ko, and Paul C. Canfield. "Robust tunability of magnetoresistance in half-Heusler R PtBi (R= Gd, Dy, Tm, and Lu) compounds." Physical Review B 93, no. 11 (2016): 115134. DOI: 10.1103/PhysRevB.93.115134. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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