Temperature-dependent electronic structure and topological property of the Kondo semimetal CeFe2Al10

Crossover from Kondo semiconductor to metallic antiferromagnet with5d-electron doping inCeFe2Al10

“…This suggests that the overall chemical pressure effect will be negligible. The Fe-3d and Ce-4 f anisotropic hybridization near the Fermi level is important for gap formation in CeT 2 Al 10 [15]. Band structure calculations reveal a highly anisotropic Fermi surface that is extended along the k y direction ( -Y direction of the Brillouin zone).…”

“…Cerium-based intermetallic systems CeT 2 Al 10 (T = Os, Ru, or Fe) with an orthorhombic YbFe 2 Al 10 -type crystal structure (space group Cmcm) have attracted considerable interest in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In these materials, a hybridization gap opens in the vicinity of the Fermi level owing to the strong coupling between the localized 4 f electrons and itinerant conduction electrons (cf hybridization) at low temperatures [7,10,11].…”

“…15 with that observed in CeRu 2 Al 10 and CeOs 2 Al 10[69]. In CeRu 2 Al 10 there are two well-defined CEF excitations at 30 and 45 meV at 5 K. At 44 K (i.e., above T N = 27 K), the two clearly resolved CEF excitations are transformed into one broad excitation near 30 meV with a tail up to 80 meV (a second possible CEF excitation is seen near 45 meV in the tail).…”

A 2D heavy fermion CePb3 kagome material on silicon: emergence of unique spin polarized states for spintronics

“…1 The defining property of heavy-fermion metals is the large effective mass of their charge carriers, which is typically enhanced from the non-interacting value by three orders of magnitude. 2 Confinement of the heavy quasiparticles on the atomic scale gives rise to a strong spin–orbit coupling effect, non-trivial topology 3,4 and topological Hall effect, 5 flat bands, 6 multiple polarons, 7 highly anisotropic ferromagnetism 8 and other emergent effects, which are in high demand in the nanotechnology industry. 9 There are currently about 50 heavy-fermion superconductors, 2 including unconventional ones, 10 which are often driven by antiferromagnetic quantum criticality 11,12 where the physics of Kondo destruction plays an essential role.…”

A crossover from Kondo semiconductor to metallic antiferromagnet with $5d$-electron doping in CeFe$_2$Al$_{10}$

“…Cerium-based intermetallic systems CeT 2 Al 10 (T = Os, Ru, or Fe) with an orthorhombic YbFe 2 Al 10type crystal structure (space group Cmcm) have attracted considerable interest in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In these materials, a hybridization gap opens in the vicinity of the Fermi level owing to the strong coupling between the localized 4f electrons and itinerant conduction electrons (c-f hybridization) at low temperatures [7,10,11].…”