engleski

Electronic Structure of Yb(Ni1−xCox)3Ga9 Studied by Angle-resolved Photoelectron Spectroscopy

Chiral crystal YbNi3Ga9 is known as an intermediate valence compound in which a strong hybridization between the 4 f orbitals and the conduction band is present. The Co-substitution to YbNi3Ga9 works as a hole doping that reduces the Kondo temperature and enhances the effective mass of itinerant charge carriers. Using angle-resolved photoelectron spectroscopy, the complex band structure of Yb(Ni1−xCox)3Ga9 (x ¼ 0 ; 0:1) is revealed. A Yb2+ 4 f7=2 band and evidences of hybridization to valence bands are found near the Fermi level. Both YbNi3Ga9 and the Co-substituted compound exhibit double hexagonal Fermi surfaces centered at the -point, surrounded by a large snowflake-like surface, and a triangular electron-like surface along the M direction. By changing the incident photon energy, the band dispersion along the c- axis and the barrel-shaped Fermi surface is observed.

Electronic structure

nije evidentirano