TY - JOUR
T1 - Correlation effect in resonant photoemission spectra of UPd2Al3 and UC
AU - Ejima, T.
AU - Sato, S.
AU - Suzuki, S.
AU - Fujimori, S.
AU - Yamada, M.
AU - Sato, N.
AU - Onuki, Y.
AU - Komatsubara, T.
AU - Tezuka, Y.
AU - Shin, S.
AU - Ishii, T.
N1 - Funding Information:
As mentioned in the introduction, band calculations for these materials are confirmed by the dHvA measurementsA. nd the presentr esultss ug-gestt hat band calculationsa re relatively good approximation to the RPES spectrao f UPdsAls and UC. Unexplained structures is supposedt o come from the final states effecto f photoemission,t hat is correlation effect. Based on the GS model, main parameterso f the correlation effect are the correlation energy between U5f electrons, Vjf, and the hybridization energy betweent he W5f states and valence states of ligand atoms, V [9]. In the case of 4f materials,p eak position of the satellite in valence PES spectrum is proportional to the correlation energyb etween4 f electrons. FeaturesA and B in Fig. 2 are considereda s correspondingt o the satellite peaks, and the peak positions betweent hem are not so different to each other. Therefore, the correlation energies,V jj, for both materials are expectedt o be nealy equal The other factor, hybridization energy,V , will be estimatedb y a satellite structure, which is ob-servedi n uranium core line spectra. In the U4f core line spectra, the existenceo f one symmetrically shaped satellite associatedw ith the asymmetric main band have been shown for various uranium compounds [lo]. We decomposedt he shapeo f U4f core line spectra into the main lines and the satellites [lo]. As a results,w idths and in-tegratedi ntensities of the satellites are classified into two groups, depending on the hybridization energy. On the other hand, L. M. Sandratskii ei al. showed that the shape of the valence DOS curve changes as the hybridization energy as a function of hybridization partner [S]. These facts lead to the speculation that the hybridization energy, V, plays an important role in the spectrald is-crepanciesf or the calculated DOS in the present study. Recently,S . Fujimori et al. is measuredt he core line spectrao f UPdzAls, suggestingt hat the satellite width and intensity of UPdz Als arel argert han those of UC [ll]. This means that the hybridization energy, V, in UPdrAls will be larger than that of UC. The authors appreciate ISSP stuff for azsist-ing us in the experiments. This work was partly supported by the Grant-in-Aid for Scientific & search on Priority Areas “Physics of Actinide Compounds”, No.02216108f,r om the Ministry of Education, Sciencea nd Culture, Japan.
PY - 1996/5
Y1 - 1996/5
N2 - Both U5f partial density of states (DOS) and partial DOS without U5f for UPd2Al3 and UC were experimentally obtained by using U5d-5f resonant photoemission technique. Both spectra are compared with the results obtained by the energy band calculation. From the comparison, the spectra of U5f partial DOS cannot be reproduced by the band calculation except for the Fermi edge structures. In contrast, the spectra of partial DOS without U5f states are reproduced well by those from ligands. These facts suggest that the spectra are not explained only by the band theory, but the correlation effect. S0368204896026990.
AB - Both U5f partial density of states (DOS) and partial DOS without U5f for UPd2Al3 and UC were experimentally obtained by using U5d-5f resonant photoemission technique. Both spectra are compared with the results obtained by the energy band calculation. From the comparison, the spectra of U5f partial DOS cannot be reproduced by the band calculation except for the Fermi edge structures. In contrast, the spectra of partial DOS without U5f states are reproduced well by those from ligands. These facts suggest that the spectra are not explained only by the band theory, but the correlation effect. S0368204896026990.
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U2 - 10.1016/s0368-2048(96)80048-x
DO - 10.1016/s0368-2048(96)80048-x
M3 - Article
AN - SCOPUS:0038871643
SN - 0368-2048
VL - 78
SP - 147
EP - 150
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
ER -