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arXiv · 2603.07702

Magnetic and electrical transport properties of the single-crystalline half-Heusler antiferromagnet DyNiSb

Abhinav Agarwal·Prabuddha Kant Mishra·Orest Pavlosiuk·Maciej J. Winiarski·Piotr Wisniewski·Dariusz Kaczorowski
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Abstract

High-quality single crystals of the half-Heusler compound DyNiSb were investigated for their low temperature thermodynamic and magnetotransport properties. Magnetic susceptibility, heat capacity, and electrical resistivity measurements revealed two distinct magnetic phase transitions at TN1 = 7.3 K and TN2 = 3.4 K, contrasting with previous reports on polycrystalline samples, which identified only a single transition near TN2 . Moreover, the studied samples were found to exhibit Metal like conductivity, at odds with a semiconducting behavior reported for the polycrystals. Magnetoresistance measurements performed in both transverse and longitudinal configurations revealed in small magnetic fields a weak antilocalization effect that diminishes with increasing temperature, giving way to a positive, monotonic magnetoresistance at high temperatures. Angular-dependent resistivity studies showed a crossover from fourfold to twofold symmetry with increasing magnetic-field strength, suggesting a field-induced reconstruction of the Fermi surface. Our findings highlight a complex magnetic and electrical transport behavior in DyNiSb, highly sensitive to structural disorder and easily tunable by external magnetic field.

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Abhinav Agarwal, Prabuddha Kant Mishra, Orest Pavlosiuk, Maciej J. Winiarski, Piotr Wisniewski, Dariusz Kaczorowski. 2026-03-08. Magnetic and electrical transport properties of the single-crystalline half-Heusler antiferromagnet DyNiSb. https://doi.org/10.1103/vgtv-nkvd

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