Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-04-30
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 5 figures
Scientific paper
Three-dimensional Fermi surfaces at a high temperature have been clarified for a strongly correlated Ce compound, ferromagnet CeRu$_2$Ge$_2$ in the paramagnetic phase, by virtue of a soft x-ray $h\nu$-dependent (700-860 eV) ARPES. Although the observed Fermi surfaces as well as quasiparticle dispersions are partly explained by a band-structure calculation based on a localized $4f$ model, qualitative discrepancy in experiments, between our APRES in the paramagnetic phase and de Haas-van Alphen measurement in the ferromagnetic phase, is revealed. This suggests a fundamental change in the $4f$ contribution to the Fermi surfaces across the magnetic phase transition widely seen for Ce compounds.
Fujiwara Hideaki
Imada Shin
Muro Takayuki
Onuki Yoshichika
Saita Takeshi
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