Figure 1

Schematic of the modification of the FS upon formation of AFM order. (a) represents a notional heavy composite FS constructed from two bands, the larger of which may be subject to quantum fluctuations with respect to the translational vector $\mathbf{Q}$ on approaching a SDW phase transition at zero temperature. The process of translation (b) causes the larger section to be fragmented, leaving the smaller section intact. Quasiparticles may be able to tunnel through the SDW gaps in a magnetic fields, enabling the orbits of the original unreconstructed FS (dotted lines) to be observed. (c) shows the same FS as in (a) in the absence of SDW fluctuations. Instead, the entire FS may be subject to quantum fluctuations, with an entirely different FS in (d) being created on entering the AFM phase, for which Bragg reflection effects are less significant.Reuse & Permissions

Figure 2

A plot of the various frequencies $F_i$ (in tesla) versus the substituted concentration $x$ of Ce, for $M=$ Co, Rh, and Ir in order of increasing atomic weight. The actual FS cross-sectional areas in $k$ space can be obtained by applying the Onsager relation. The nomenclature introduced by Shishido et al. [13] is used for the subscripts $i$.Reuse & Permissions

Figure 3

A comparison of the FSs of the pure La (open symbols) and Ce (filled symbols) compounds for $M=\mathrm{C}\mathrm{o}$ (a) and $M=\mathrm{I}\mathrm{r}$ (b), made by means of angle-dependent studies, where $\theta$ is angle between of $\mathbf{H}$ and the tetragonal $c$ axis. Data for $M=\mathrm{I}\mathrm{r}$ and $x=1$ are taken from Haga et al. [15].Reuse & Permissions

Figure 4

A plot of the dependence of the quasiparticle effective masses $m_i^{*}$ on $x$ for the various FS cross sections observed in $M=\mathrm{C}\mathrm{o}$ (a), Rh (b), and Ir (c), obtained from fitting the $T$ dependence of the dHvA amplitudes for $20<B<40\mathrm{T}$, $10<B<20\mathrm{T}$, and $25<B<45\mathrm{T}$, respectively. The symbols refer to the different frequencies identified in Figs. 2, 3. (d) $l$ for the $F_{\beta 2}$ frequency as a function of $x$ for $M=$ Co, Rh, and Ir.Reuse & Permissions