Univ Michigan Dept Phys Ann Arbor Mi 48109
Univ Tokyo Inst Solid State Phys Synchrotron Radiat Lab Tanashi Tokyo 188 Japan
Max Planck Inst Festkorperforsch W-7000 Stuttgart 80 Germany
Tohoku Univ Dept Phys Sendai Miyagi 980 Japan
Univ Tokyo Dept Phys Bunkyo Ku Tokyo 113 Japan
Seoul Natl Univ Dept Phys Seoul 151742 South Korea
Natl Lab High Energy Phys Photon Factory Oho Ibaraki 305 Japan
Univ Gottingen Inst Theoret Phys W-3400 Gottingen Germany
Univ Calif San Diego Inst Pure & Appl Phys Sci La Jolla Ca 92093

Discrepancies between two published sets of Anderson Hamiltonian parameter values for mixed-valence YbAl3 obtained from electron-spectroscopic studies [S.-J. Oh et al., Phys. Rev. B 37, 2861 (1988); F. Patthey et al., ibid. 36, 7697 (1987)] are discussed. It is shown that these discrepancies mainly stem from the different Yb valences of the two samples studied. It is pointed out that the parameter set which puts YbAl3 in the Kondo regime is more consistent with other physical measurements such as the magnetic susceptibility and x-ray-absorption-edge spectroscopy.
 

Physical Review B, 46 1866-1869, 1992.