Fig. 2: Brillouin zone, Fermi surface, and magnetotransport measurements.
From: Evidence for topological semimetallicity in a chain-compound TaSe3
a Bulk Brillouin zone (BZ) of TaSe3 with the high-symmetry points and the projected surface BZ, highlighted in green22. b Fermi surface with the hole (purple) and electron (yellow–green) pockets22. The closed electron pockets near the B point and the hole pocket [~k1 into the page] are enlarged for clarity. The red arrow indicates the applied field direction. The red lines indicate cyclotron orbits for which SdH oscillations were observed. c ρb vs. T measured at various magnetic fields with H ⊥ I. Inset: H dependence of the two characteristic temperatures: Tm (black squares) is defined as the point where ∂ρb(T, H)/∂T = 0 and Ti (blue circles) is where ∂ρb(T, H)/∂T is minimum. d Determination of the resistivity change between 0 and 7 T, described by Eq. (3). The black, blue, and purple symbols represent ρb(0 T), ρb(7 T), and ρb(7 T) − ρb(0 T), respectively. The solid green and magenta lines represent fits to Eq. (3) and Δρ = αHn/ρ(T, 0)n−1, respectively. e MR vs. H at various temperatures. f Kohler’s plot of the MR data (MR vs. H/ρ0) in the temperature range of T = 1.9–12 K. Inset: MR vs. H/ρ0 at T = 4 K. The solid blue line represents a fit to Eq. (2). (a, b are adapted with permission from ref. 22, copyright (2018) by The American Physical Society).
