Electronic structures of CeRu$_2X_2$ ($X$ = Si, Ge) in the paramagnetic phase studied by soft X-ray ARPES and hard X-ray photoelectron spectroscopy

M. Yano; A. Sekiyama; H. Fujiwara; Y. Amano; S. Imada; T. Muro; M. Yabashi; K. Tamasaku; A. Higashiya; T. Ishikawa; Y. Onuki; S. Suga

doi:10.1103/PhysRevB.77.035118

paper

Electronic structures of CeRu $_{2} X_{2}$ ( $X$ = Si, Ge) in the paramagnetic phase studied by soft X-ray ARPES and hard X-ray photoelectron spectroscopy

arXiv:0708.1371 · doi:10.1103/PhysRevB.77.035118

Abstract

Soft and hard X-ray photoelectron spectroscopy (PES) has been performed for one of the heavy fermion system CeRu $_{2}$ Si $_{2}$ and a $4 f$ -localized ferromagnet CeRu $_{2}$ Ge $_{2}$ in the paramagnetic phase. The three-dimensional band structures and Fermi surface (FS) shapes of CeRu $_{2}$ Si $_{2}$ have been determined by soft X-ray $h ν$ -dependent angle resolved photoelectron spectroscopy (ARPES). The differences in the Fermi surface topology and the non- $4 f$ electronic structures between CeRu $_{2}$ Si $_{2}$ and CeRu $_{2}$ Ge $_{2}$ are qualitatively explained by the band-structure calculation for both $4 f$ itinerant and localized models, respectively. The Ce valences in CeRu $_{2} X_{2}$ ( $X$ = Si, Ge) at 20 K are quantitatively estimated by the single impurity Anderson model calculation, where the Ce 3d hard X-ray core-level PES and Ce 3d X-ray absorption spectra have shown stronger hybridization and signature for the partial $4 f$ contribution to the conduction electrons in CeRu $_{2}$ Si $_{2}$ .

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Probing the phase diagram of CeRu_2Ge_2 by thermopower at high pressure

Electronic structures of CeRu2​X2​ (X = Si, Ge) in the paramagnetic phase studied by soft X-ray ARPES and hard X-ray photoelectron spectroscopy

Abstract

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Electronic structures of CeRu $_{2} X_{2}$ ( $X$ = Si, Ge) in the paramagnetic phase studied by soft X-ray ARPES and hard X-ray photoelectron spectroscopy