Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.64: Poster
Monday, March 9, 2026, 09:30–12:30, P2
Ab-initio investigation of altermagnetic splitting in the NiAs-type solid solutions (Cr,Mn)-(Sb,Te) — •Karel Knížek and Kyohoon Ahn — Institute of Physics, Czech Academy of Sciences, Prague, Czechia
CrSb is a layered collinear antiferromagnet with perpendicular magnetic anisotropy in the hexagonal structure of NiAs-type, which holds particular interest for AFM spintronics since it belongs to a few compounds which have both high ordering temperature (TN = 705 K) and substantial altermagnetic spin splitting. Phase diagrams of solid solutions between antiferromagnetic CrSb and ferromagnetic MnSb and CrTe are rich in many various magnetic arrangements [1,2,3]. The observed evolution of the magnetic order as a function of composition for both phase diagrams is consistent with the assumption of the dominance of the M-X-M (M=Cr,Mn, X=Sb,Te) superexchange interaction. The strength of this interaction depends on the M-X-M angle, which is correlated with trigonal distortion of the MX6 octahedra. Within these phase diagrams, we have performed electronic structure calculation to investigate the evolution of magnetic ordering, with focus on the altermagnetic spin splitting in case of antiferromagnetic ordering, as a function of structural parameters, namely the trigonal distortion and cell volume. In particular we have studied the effect of uniaxial pressure.
[1] F.K.Lotgering et al., J. Phys. Chem. Solids 3, 238 (1957).
[2] W.J.Takei et al., J. Appl. Phys. 37, 973 (1966).
[3] W Reimers et al., J. Phys. C: Solid State Phys. 15 3597 (1982).
Keywords: altermagnet; CrSb; trigonal distortion