Robust tunability of magnetoresistance in half-Heusler ( , Dy, Tm, and Lu) compounds
- Ames Lab. and Iowa State Univ., Ames, IA (United States); Simon Fraser Univ., Burnaby, BC (Canada)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
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. Furthermore, 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.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1349903
- Alternate ID(s):
- OSTI ID: 1242844
- Report Number(s):
- IS-J-8987; PRBMDO
- Journal Information:
- Physical Review B, Vol. 93, Issue 11; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd)
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journal | March 2018 |
Rare earth-based quaternary Heusler compounds M CoV Z ( M = Lu, Y; Z = Si, Ge) with tunable band characteristics for potential spintronic applications
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Anomalous Hall effect in Weyl semimetal half Heusler compounds RPtBi (R = Gd and Nd) | text | January 2016 |
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