Electronic band structure and proximity to magnetic ordering in the chiral cubic compound CrGe

Abstract

CrGe belongs to the family of cubic B20 intermetallics. From experimental investigations by susceptibility and de Haas-van Alphen (dHvA) measurements and from calculations of its electronic band structure by densityfunctional theory (DFT), CrGe is found to form a metallic paramagnetic ground state. Combining dHvA and DFT data, a detailed picture of the Fermi surface of CrGe is provided. The proximity to a magnetic longrange ordering in CrGe is suggested from a prominent thermal magnetic susceptibility. The possibility to induce magnetic long-range order in CrGe is discussed based on calculated properties for CrGe substituting Ge by As or Sn, and from a comparison with MnGe and the alloy series Cr 1−x Mn x Ge. Owing to the noncentrosymmetric and nonsymmorphic crystal structure of CrGe, in absence of broken time reversal symmetry, its band structure is marked by forced nodal lines at the Fermi edge. Moreover, this material hosts degenerate unconventional electronic quasiparticles. In particular, CrGe exhibits a sixfold degeneracy of fermions crossing within about 5 meV of the Fermi energy at the R point of the Brillouin zone.

Single Crystal Growth and de Haas–van Alphen Effect of Non-Centrosymmetric Heavy-Fermion Compound UPt5

“…most likely due to the magnetic breakdown or "orbital crossing" of the split Fermi surfaces in the non-centrosymmetric crystal structure, as reported in Yb 4 Sb 3 [13]. A similar phenomenon has been reported in several non-centrosymmetric metallic compounds, such as a cubic non-centrosymmetric uranium heavy-fermion U 3 Ni 3 Sn 4 [14] and a chiral cubic compound CrGe [15]. To clarify the electronic state of UPt 5 , we performed the energy band calculations using a full potential linear augmented plane wave (FLAPW) method with a local density approximation (LDA) for the 5 f -itinerant model.…”

Flat-band magnetism and helical magnetic order in Ni-doped SrCo2As2

“…There is a broad maximum arising around 100 K for x = 0 and 50 K for x = 0.0125, similar to previous report on SrCo 2 As 2 19 in which the maximum in χ(T ) was attributed to a cross-over from a coherent to an incoherent Fermi liquid state with increasing T . However, we note that this broad maximum also exists in other itinerant magnetic materials in the proximity to ferromagnetism, such as CrGe 33 . The gradual suppression with Ni substitution might suggest its close relationship with the novel magnetic phase observed in compounds with larger Ni substitution.…”

Growth Process, Structure and Electronic Properties of Cr2GeC and Cr2-xMnxGeC Thin Films Prepared by Magnetron Sputtering

“…Considering the structural data and transport properties, it can be concluded that samples #5 ÷ #7 exhibited a high crystalline quality despite the presence of the CrGe phase in samples #5 and #6, according to XRD. Our conclusion was based on the fact that CrGe had two times higher resistivity and a very high RRR value of 260 [38]. However, no significant increase in ρ and RRR was observed for our films.…”