Pt-induced semimetallic transport and enhanced thermoelectric response in the half-Heusler alloy YNi_{0.5}Pt_{0.5}Bi
Abstract
Half-Heusler alloys provide a versatile platform for tuning electronic and thermal transport through chemical substitution. Here, we investigate the thermoelectric and magnetotransport properties of spark-plasma-sintered YNi_{0.5}Pt_{0.5}Bi. Partial substitution of Ni by Pt drives YNiBi toward semimetallic transport, characterized by hole-dominated conduction, a low Hall carrier concentration of 1.9 × 1019 cm−3, and a sizeable nonsaturating magnetoresistance of 18% at 300 K under 14 T. Compared with YNiBi, Pt alloying increases the room-temperature Seebeck coefficient from approximately 90 to 130 μV K−1, while reducing the thermal conductivity to 3.15 W m−1 K−1. Single-parabolic-band analysis indicates an enhanced carrier effective mass, resulting in a room-temperature power factor of 13.7 μW cm−1 K−2 and a figure of merit (zT= 0.13). First-principles calculations further show a Pt-induced closing of the electronic band gap and a low density of states near the Fermi level, consistent with the experimentally observed semimetal-like transport. These results demonstrate that Ni/Pt alloying provides an effective route for simultaneously tuning the electronic, magnetotransport, and thermoelectric properties of YNiBi-based half-Heusler compounds.
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BibTeX
@misc{chahar2026ptinduced,
title = {{Pt-induced semimetallic transport and enhanced thermoelectric response in the half-Heusler alloy YNi_0.5Pt_0.5Bi}},
author = {Vikas Chahar and Shivam Rathod and Lankun Wang and Sneh and Shubhadeep Bej and Divya Prakash Dubey and Dinesh Dixit and Abdelmoneim Elkhouly and Raúl Cardoso-Gil and Zihang Liu and Xiao Xu and Rie Y. Umetsu and Ratnamala Chatterjee and Kaustuv Manna},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.22253},
eprint = {2610.22253},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.22253},
}
RIS
TY - UNPB
TI - Pt-induced semimetallic transport and enhanced thermoelectric response in the half-Heusler alloy YNi_{0.5}Pt_{0.5}Bi
AU - Vikas Chahar
AU - Shivam Rathod
AU - Lankun Wang
AU - Sneh
AU - Shubhadeep Bej
AU - Divya Prakash Dubey
AU - Dinesh Dixit
AU - Abdelmoneim Elkhouly
AU - Raúl Cardoso-Gil
AU - Zihang Liu
AU - Xiao Xu
AU - Rie Y. Umetsu
AU - Ratnamala Chatterjee
AU - Kaustuv Manna
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2610.22253
UR - https://arxiv.org/abs/2610.22253
AB - Half-Heusler alloys provide a versatile platform for tuning electronic and thermal transport through chemical substitution. Here, we investigate the thermoelectric and magnetotransport properties of spark-plasma-sintered YNi_{0.5}Pt_{0.5}Bi. Partial substitution of Ni by Pt drives YNiBi toward semimetallic transport, characterized by hole-dominated conduction, a low Hall carrier concentration of 1.9 × 10^19 cm^−3, and a sizeable nonsaturating magnetoresistance of 18% at 300 K under 14 T. Compared with YNiBi, Pt alloying increases the room-temperature Seebeck coefficient from approximately 90 to 130 μV K^−1, while reducing the thermal conductivity to 3.15 W m^−1 K^−1. Single-parabolic-band analysis indicates an enhanced carrier effective mass, resulting in a room-temperature power factor of 13.7 μW cm^−1 K^−2 and a figure of merit (zT= 0.13). First-principles calculations further show a Pt-induced closing of the electronic band gap and a low density of states near the Fermi level, consistent with the experimentally observed semimetal-like transport. These results demonstrate that Ni/Pt alloying provides an effective route for simultaneously tuning the electronic, magnetotransport, and thermoelectric properties of YNiBi-based half-Heusler compounds.
ER -