Tunable quantum transport in topological semimetal candidates La_xSr_1-xMnSb₂

¹ School of Materials Science and Engineering, Anhui University - Hefei 230601, China
² Institutes of Physical Science and Information Technology, Anhui University - Hefei 230601, China
³ Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045, China
⁴ Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences - Hefei 230031, China
⁵ University of Science and Technology of China - Hefei 230026, China

Received: 12 May 2024
Accepted: 22 August 2024

Abstract

The magnetic semimetal SrMnSb₂ contains a nonsymmorphic crystal symmetry that could protect Dirac crossings, offering the coexistence of a quasi-two-dimensional characteristic, magnetic order and nontrivial topology in bulk single crystals. Here, we report the evolution of Fermi surfaces by probing quantum oscillations in the La_xSr_1-xMnSb₂ single crystals. Hall measurements reveal that the conduction process changes from a hole-dominated multiband nature to a single hole-band nature after La doping. Compared with parent-SrMnSb₂, the Fermi surface corresponding to F_α is slightly enlarged and the small Fermi surface corresponding to F_γ appears with a tunable feature in La-doped crystals. The topological semimetal candidates La_xSr_1-xMnSb₂ provide a fine-tuning platform for potential applications in the future.