Photoemission study of the Laves-phase compounds YMn2 and Y0.97Sc0.03Mn2

✍ Scribed by J.-Y. Son; T. Mizokawa; A. Fujimori; K. Terao; H. Yamada; H. Wada; M. Shiga

• Book ID: 104166182
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 314 KB
• Volume: 127
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00351-x

✦ Synopsis

A small amount of Sc substitution for Y in the antiferromagnetic metal YMn 2 results in a paramagnetic metal with a strongly enhanced electronic specific heat. We have studied the electronic structure of YMn 2 and Y 0.97 Sc 0.03 Mn 2 by photoemission spectroscopy. The spectra of YMn 2 taken above and below the Ne ´el temperature did not show appreciable difference, and the spectra of YMn 2 and Y 0.97 Sc 0.03 Mn 2 were similar to each other. The photoemission spectra of the antiferromagnetic phase are well explained by band-structure calculation on the antiferromagnetic state while those of the paramagnetic phase are not explained by band-structure calculation on the paramagnetic state. These observations suggest that there are strong antiferromagnetic correlations in the paramagnetic phase. For the paramagnetic phase, agreement between experiment and calculation could be considerably improved by applying a model self-energy correction to the band density of states.