Open AccessElectronic structure of Yb X Cu 4 ( X = In, Cd, Mg) investigated by high‐resolution photoemission spectroscopy
Author(s) -
Sato H.,
Hiraoka K.,
Taniguchi M.,
Takeda Y.,
Arita M.,
Shimada K.,
Namatame H.,
Kimura A.,
Kojima K.,
Muro T.,
Saitoh Y.,
Sekiyama A.,
Suga S.
Publication year - 2002
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049502009226
Subject(s) - synchrotron radiation , spectral line , photoemission spectroscopy , electronic structure , valence (chemistry) , spectroscopy , fermi level , angle resolved photoemission spectroscopy , atomic physics , materials science , analytical chemistry (journal) , x ray photoelectron spectroscopy , chemistry , nuclear magnetic resonance , physics , optics , nuclear physics , electron , computational chemistry , organic chemistry , quantum mechanics , astronomy , chromatography
The valence‐band electronic structure of Yb X Cu 4 ( X = In, Cd, Mg) has been investigated by means of temperature‐dependent high‐energy‐resolution photoemission spectroscopy using a He I resonance line ( h ν = 21.22 eV) and synchrotron radiation ( h ν = 800 eV). Intensities of the structure due to the Yb 2+ 4 f 7/2 states in the He I spectra of YbInCu 4 and YbCdCu 4 gradually increase with decreasing temperature from 300 to 10 K, and Yb 2+ 4 f 7/2 structures are clearly observed as peaks near the Fermi level ( E F ) at 10 K. The enhancement of the Yb 2+ 4 f 7/2 peak from 50 to 10 K is much greater for YbInCu 4 than for YbCdCu 4 . On the other hand, the Yb 2+ 4 f 7/2 states of YbMgCu 4 are observed as a broad structure near E F . In the synchrotron radiation photoemission spectra of YbInCu 4 and YbCdCu 4 , the structures due to the Yb 2+ and Yb 3+ 4 f states are recognized at all temperatures. The intensity ratio Yb 2+ /Yb 3+ gradually increases with decreasing temperature. The energy separations between the Yb 2+ and Yb 3+ 4 f structures of YbInCu 4 increase from 50 to 20 K. For YbMgCu 4 , on the other hand, almost only the Yb 2+ structures are observed and little temperature dependence has been detected.