Abstract
Extremely large magnetoresistance (EXMR) and high mobility are always desired for use in spintronic devices. Herein, we report the observation of EXMR and very large hole mobility reaching ∼ 2 × 104% (30 T) and ∼2 × 104 cm2 V−1 s−1, respectively, at 2 K in an unfilled skutterudite CoP3 crystal. The magnetotransport measurements unveil remarkable Shubnikov–de Haas quantum oscillations hosting nontrivial Berry phase induced by strong Zeeman splitting. First-principles calculations suggest band inversion between Co-dxy/yz and P-pz orbitals, which forms fourfold quadratic contact point at the Γ point above the Fermi level of ∼0.146 eV. The angle-resolved photoelectron spectroscopy measurements verify the calculated surface state. The results provide a quadratic contact point semimetal, which has potential applications in topological devices.
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