Is YbAs a heavy fermion system?

✍ Scribed by R. Monnier; L. Degiorgi; B. Delley; D.D. Koelling

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 255 KB
• Volume: 163
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(90)90140-p

✦ Synopsis

Using parameters

extracted from a tight binding fit to an ab initio band structure, the specific heat anomaly observed in YbAs around 5 K is computed within the infinite lJ limit of the degenerate Anderson impurity model. Applying the renormalization procedure derived in variational treatments of the periodic Anderson model, a quasiparticle Fermi surface with strong nesting features and small mass enhancements is obtained.

The results suggest that YbAs is not a "classical" heavy Fermion system.