We have carried out de Haas–van Alphen (dHvA) experiments on a ferromagnet
CeRh3B2
with an extremely high Curie temperature K and a non-4f reference compound
LaRh3B2. The dHvA
data of LaRh3B2
are well explained by the results of energy band calculations. The topology of the Fermi surfaces in
CeRh3B2 is found to be very
similar to that of LaRh3B2,
possessing wavy but flat Fermi surfaces in the basal plane. Observation of a
quasi-one-dimensional electronic state is the first such case in a rare earth compound.
CeAuSb 2 has previously been classified as an antiferromagnet with moderately enhanced electron masses. As the magnetic order is suppressed by a magnetic field, non-Fermi liquid behaviour has been shown to emerge, suggesting the presence of a quantum critical point (QCP). Within the ordered phase a metamagnetic transition was detected. Here we investigate the material by isothermal magnetization M(H), transverse magnetoresistivity r t (H) and Hall resistivity r H (H) measurements. We show that the metamagnetic transition splits into two first order transitions below 2 K. Pronounced anomalies in r t (H) and r H (H) are not only observed at the QCP and the metamagnetic transitions but also at a new characteristic field above the QCP.
A mistake in our recent paper has been found, namely, a misinterpretation of the magnetic structure analysis (p. 7, second column, second and third paragraphs). Nevertheless, the reported magnetic structure (Fig. 9) was correct. During the analysis, the c component of the magnetic moment (m c) for 2 mistakenly was considered to be similar to 1 , which led to equal quality of fits for both 1 and 2. However, the correct sequences for m c (+ − +−) for 1 and (+ − −+) for 2 are different. The analysis with the corrected sequences reveals that the refinement with 2 (R mag = 26.8%) does not fit the experimental magnetic pattern. Only 1 reproduces the experimental magnetic pattern at 1.5 K (R mag = 11.8%). Therefore, the magnetic structure follows 1. The corrected paragraph [for paragraphs 2 and 3 of the original paper (p. 7, second column)] should be read as "The refinement of the magnetic structure was attempted for all four 's. Only 1 reproduces the experimental magnetic pattern at 1.5 K (R mag = 11.8%) [Fig. 8(c)]. The basis vectors for 1 (Table IV) indicate that all three components of the magnetic moment are refinable. Their simultaneous refinement yields m a = 0.22(6) μ B , m b = −0.03(9) μ B , and m c = 1.74(3) μ B with the total magnetic moment of m = 1.75(8) μ B at 1.5 K. The component m b is zero within the standard deviation, and an equal quality of the fit was obtained with m b = 0, in agreement with the experiment, where M(H) is linear in low fields and no signatures of net magnetization or hysteresis are observed (Fig. 5). In contrast, a finite m b value would lead to a weakly ferromagnetic structure at odds with the experiment. Therefore, we conclude that the m b component is zero. The obtained values indicate that the spins are lying on the ac plane with a predominant component along the c axis. The ordered moment is about 10% smaller than the spin-only value of 2 μ B for S = 1 and 25% smaller than the full moment of gSμ B = 2.33 μ B expected for g = 2.33 when the contribution of the orbital moment is included for this sample."
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