Figure 1

dHvA oscillations in the nematic phase. Top: dHvA oscillations in ${\partial }^{2}M/\partial H^2$ in the region surrounding the metamagnetic transition. From left to right, three magnetic features are visible, denoted $A$, $B$, and $C$ on the diagram (see text). Left: The raw signal in the nematic phase region. Right: Nematic phase oscillations remaining after background removal at 15 different temperatures. In the left and right graphs, curves are offset for clarity.Reuse & Permissions

Figure 2

Top: Fourier spectrum of the dHvA data on the low-field side of the transition, between 5 and 6.5 T, with the field aligned with the $c$ axis. Inset: Fourier spectra of the nematic phase data at all temperatures. Main panel: Temperature dependence of the amplitude of the nematic phase oscillations. Solid lines represent LK fits to the data, which revealed quasiparticle masses of $6.1\pm 0.3m_e$ and $7.4\pm 0.2m_e$ for the 1.0 and 2.3 kT peaks, respectively. Data plotted with crosses were not used in the nonlinear fits [29].Reuse & Permissions

Figure 3

Field dependence of the dHvA frequencies situated near 1.8 and 4.1 kT on the low-field side. These feature nonlinear changes in the metamagnetic region. The data points correspond to the location of peaks in Fourier transforms taken over field windows of equal inverse field width of $0.005{\mathrm{T}}^{-1}$. The field value for each data point corresponds to the inverse of the average inverse field. The lines mark the nematic phase field boundaries, and the cross the value of frequency measured inside the nematic phase. The top panel is a blowup of the data within the square in the bottom panel. Three peaks in $F(B)$, denoted $A\mathrm{\text{−}}C$ are observed near each of the metamagnetic features shown in Fig. 1. Corrections to field values due to the intrinsic magnetisation were found to be small.Reuse & Permissions

Figure 4

Three scenarios where field dependent dHvA frequencies may be encountered. In each case, the dispersion is shown on the left, the Fermi surface cross-sectional area as a function of magnetic field $A(B)$ in the center and the dHvA frequency as a function of magnetic field $F(B)$ on the right. Large changes in the slope of $A(B)$ lead to peaks in $F(B)$ [31]. (a) A field dependent $g$ factor leads to nonlinear changes in $A(B)$ for each spin species, producing peaks of opposite sign in $F(B)$. (b) A flattening of the dispersion leads to a large change in $F(B)$ for only one spin species. (c) A change in chemical potential leads to peaking of $F(B)$ that is similar for both spin species (see text).Reuse & Permissions