Anomalous quantum oscillations and evidence for a non-trivial Berry phase in SmSb

Abstract

Topologically non-trivial electronic structures can give rise to a range of unusual physical phenomena, and the interplay of band topology with other effects such as electronic correlations and magnetism requires further exploration. The rare earth monopnictides $X$(Sb,Bi) ($X$ = lanthanide) are a large family of semimetals where these different effects may be tuned by the substitution of rare-earth elements. Here we observe anomalous behavior in the quantum oscillations of one member of this family, antiferromagnetic SmSb. The analysis of Shubnikov-de Haas (SdH) oscillations provides evidence for a non-zero Berry phase, indicating a non-trivial topology of the $\alpha$-band. Furthermore, striking differences are found between the temperature dependence of the amplitudes of de Haas-van Alphen effect oscillations, which are well fitted by the Lifshitz-Kosevich (LK) formula across the measured temperature range, and those from SdH measurements which show a significant disagreement with LK behavior at low temperatures. Our findings of unusual quantum oscillations in an antiferromagnetic, mixed valence semimetal with a possible non-trivial band topology can provide an opportunity for studying the interplay between topology, electronic correlations and magnetism.

arXiv comment5 figures, 20 pages, Supplementary information available with open access on journal website

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• Complex electronic structure evolution of NdSb across the magnetic transition
• Temperature-Dependent and Magnetism-Controlled Fermi Surface Changes in Magnetic Weyl Semimetals
• Extremely large magnetoresistance and compensated Fermi surfaces in the antiferromagnetic semimetal YbAs
• Weak antilocalization and Shubnikov-de Haas oscillations in CaCuSb single crystal
• Temperature-dependent Fermi surface probed by Shubnikov-de Haas oscillations in topological semimetal candidates DyBi and HoBi
• Tunable non-Lifshitz-Kosevich temperature dependence of Shubnikov-de Haas oscillation amplitudes in SmSb
• Fermi surface studies of a non-trivial topological compound YSi
• Spin-orbital order and excitons in magnetoresistive HoBi
• Is it possible to determine unambiguously the Berry phase solely from quantum oscillations?