Low-frequency quantum oscillations in LaRhIn${}_5$: Dirac point or nodal line?

Abstract

In the recent paper [1], a new method based on measuring a temperature correction to a quantum-oscillation frequency was proposed to study an energy-band dispersion of charge carriers in small Fermi surface (FS) pockets of crystals. To illustrate their approach, Guo et al. [1] applied it to a number of materials and, in particular, to the multiband metal LaRhIn${}_5$ which, apart from high-frequency oscillations associated with a large FS, also exhibits the oscillations with the low frequency $F\approx 7$ T. Although the method of Ref. [1] really detects charge carriers with a linear dispersion, it does not distinguish between the carriers near a Dirac point and near a nodal line, since all such quasiparticles disperse linearly. Here we ask what is the nature of the carriers associated with the frequency $F$ in LaRhIn${}_5$ and call attention to the puzzling origin of this frequency.

This is matters arising from C. Guo et al. Nature Communications 12, 6213 (2021); 6 pages, 2 figures

References in corpus (1)

• Magnetic susceptibility of topological nodal semimetals

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