The Electrical Resistivity of Hexagonal FeGe Single Crystals

Abstract

Electrical resistivity measurements have been carried out on hexagonal FeGe (B 35), which is a uniaxial antiferromagnet with TN=411 K. The resistivity parallel to the c-axis exhibits a hump below TN, which arises from the magnetic superzones cutting and distorting different contributions to the Fermi surface. For the current in the basal plane a mere change in slope is observed in the resistivity at the Néel temperature. Critical scattering, as well as imperfections, tend to smooth out the transition behaviour and an attempt is made to determine the critical exponent in dϱ/dT = Cε-λ, where ε = |T-TN|/TN. For current parallel to the c-axis λ ≈ 0.8 for T>TN and λ ≈ -0.4 for T<TN. The case of resistivity perpendicular to the c-axis is less amenable to detailed analysis. The strong ferromagnetic ordering in the basal plane gives rise to long-range spin fluctuations, while the weak antiferromagnetic interactions along the c-axis give mainly short-range fluctuations above TN.

The Electrical Resistivity of FeSn Single Crystals

“…The values of the critical exponent of FeSn can also be compared with the values for hexagonal FeGe which is an isomorph of FeSn [15]. For T < T N 1.= -0.4 and for T>T, i=0.8 for FeGe.…”

Asymmetric skyrmion Hall effect in systems with a hybrid Dzyaloshinskii-Moriya interaction

“…We emphasize that (i) the additional consideration of the internal SOTs does not change the main result of our work, i.e., the asymmetric skyrmion Hall effect. (ii) High resistivities of chiral magnets based on Mn, Si, and Ge [90,91] (several times larger than Pt for example) imply that the effects of internal SOTs are typically smaller than those of external SOTs. Thus, we claim that the asymmetric skyrmion motion will be the dominant effect.…”

Fantastic flat bands and where to find them: The CoSn-type compounds

“…FeGe and FeSn are both antiferromagnetic across the entire measured temperature range [20,21,23,26,28,29,50]. The moment reorientation of FeGe is evident as a change in slope of C p (T ) around 100 K [20,21,23].…”

“…The antiferromagnetism of FeGe and FeSn has been thoroughly examined [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. A series of recent angular resolved photo-emission spectroscopy (ARPES) studies have investigated the electronic bands arising from the kagome lattice in FeSn [10,35] and CoSn [11,12].…”