Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Topological Semimetals

TT 41.7: Vortrag

Mittwoch, 11. März 2026, 11:15–11:30, HSZ/0103

Probing the Fermi Surface of NdAgSb₂ through Large Linear Magnetoresistance and Quantum Oscillations — •Aarti Gautam¹, Haribrahma Singh¹, Prabuddha Kant Mishra³, Rie. Y Umetsu⁴, and Ashok Kumar Ganguli^{1, 2} — ¹Indian Institute of Technology Delhi, Hauz Khas New Delhi — ²Indian Institute of Science Education and Research, Berhampur — ³Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okolna 2, 50-422 Wroclaw, Poland — ⁴Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

We present a comprehensive study of the magnetic, transport, and magnetotransport properties of single-crystalline NdAgSb₂. The compound exhibits anisotropic magnetic behavior, with an antiferromagnetic ground state for fields applied in the ab plane and de Haas van Alphen oscillations observed along the c axis. Magnetotransport measurements reveal a large linear magnetoresistance (450 % at 2 K under 9 T), indicative of a clean-limit electronic structure with suppressed scattering. Notably, both de Haas van Alphen and Shubnikov de Haas quantum oscillations are observed simultaneously, enabling a detailed mapping of the Fermi surface. Analysis of the oscillation frequencies, effective masses, and Berry phases provides insight into the low-energy electronic states governed by the two-dimensional Sb square-net topology, highlighting NdAgSb₂ as a model system to explore the interplay of anisotropic magnetism, high-mobility carriers, and quantum oscillations in layered rare-earth pnictides.

Keywords: Topological semimetals; quantum oscillations; Magnetotransport; Crystal growth; square-net materials