Electronic structure of CeRu2X2 (X=Si,Ge) in the paramagnetic phase studied by soft x-ray ARPES and hard x-ray photoelectron spectroscopy

Yano  M; Sekiyama  A; Fujiwara  HAmano  YImada  SMuro  TYabashi  MTamasaku  KHigashiya  AIshikawa  T

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Electronic structure of CeRu2X2 (X=Si,Ge) in the paramagnetic phase studied by soft x-ray ARPES and hard x-ray photoelectron spectroscopy

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Soft and hard x-ray photoelectron spectroscopy has been performed for one of the heavy fermion system CeRu2Si2 and a 4f-localized ferromagnet CeRu2Ge2 in the paramagnetic phase. The three-dimensional band structures and Fermi surface shapes of CeRu2Si2 have been determined by soft x-ray h nu-dependent angle-resolved photoelectron spectroscopy. The differences in the Fermi surface topology and the non-4f electronic structures between CeRu2Si2 and CeRu2Ge2 are qualitatively explained by the band-structure calculation for both 4f itinerant and localized models, respectively. The Ce valences in CeRu2X2 (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 4f contribution to the conduction electrons in CeRu2Si2.

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《Physical review, B. Condensed matter and materials physics》 |2008年第3期|035118-1-035118-8-0|共8页
作者
Yano M; Sekiyama A; Fujiwara HAmano YImada SMuro TYabashi MTamasaku KHigashiya AIshikawa T;
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作者单位

Osaka Univ, Grad Sch Engn Sci, Div Mat Phys, Toyonaka, Osaka 5608531, Japan;

Japan Synchrotron Radiat Res Inst, Mikazuki, Hyogo 6795198, Japan;

RIKEN, Mikazuki, Hyogo 6795148, JapanOsaka Univ, Grad Sch Sci, Dept Phys, Toyonaka, Osaka 5600043, Japan;

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正文语种英语
中图分类固体物理学;
关键词
RESOLUTION RESONANCE PHOTOEMISSION; DENSITY BAND THEORY; CE COMPOUNDS; METAMAGNETIC TRANSITION; FERMI-SURFACE; HIGH-ENERGY; NEUTRON-SCATTERING; COMPOUND CERU2SI2; ANDERSON MODEL; SPECTRA;

Electronic structure of CeRu2X2 (X=Si,Ge) in the paramagnetic phase studied by soft x-ray ARPES and hard x-ray photoelectron spectroscopy

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