TY - JOUR
T1 - Multisite effects on the core-level photoemission in Sr2RuO4
AU - Okada, Kozo
N1 - Funding Information:
The author thanks Prof. A. Kotani and Prof. I. Harada for useful discussions. This work was partially supported by a Grant-in-Aid for Scienti c Research from the Ministry of Education, Culture, Sports, Science and Technology. It was carried out by the joint research at the Institute for Solid State Physics, University of Tokyo.
PY - 2002/4
Y1 - 2002/4
N2 - Multi-Ru-site effects on the photoemission from the Ru3d core level in Sr2RuO4 are discussed on the basis of numerical diagonalization calculations for large-size cluster models. It is shown that the electrons on the Ru4d ions neighboring the core-hole site participate actively in the core-hole screening, which indicates the importance of so-called "nonlocal screening" in Sr2RuO4. However, since it occurs via the Ru4d(xy)-O2pπ bonding, the photoemission intensity which corresponds to the nonlocal screening is not large, compared with the Cu2p photoemission in high-Tc-related cuprates. From the spectral analysis, the Coulomb interaction strength between Ru4d electrons is estimated to be comparable with the width of Rudε bands. In other words, Sr2RuO4 belongs to a category of strongly correlated electron systems.
AB - Multi-Ru-site effects on the photoemission from the Ru3d core level in Sr2RuO4 are discussed on the basis of numerical diagonalization calculations for large-size cluster models. It is shown that the electrons on the Ru4d ions neighboring the core-hole site participate actively in the core-hole screening, which indicates the importance of so-called "nonlocal screening" in Sr2RuO4. However, since it occurs via the Ru4d(xy)-O2pπ bonding, the photoemission intensity which corresponds to the nonlocal screening is not large, compared with the Cu2p photoemission in high-Tc-related cuprates. From the spectral analysis, the Coulomb interaction strength between Ru4d electrons is estimated to be comparable with the width of Rudε bands. In other words, Sr2RuO4 belongs to a category of strongly correlated electron systems.
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U2 - 10.1142/S0218625X02003287
DO - 10.1142/S0218625X02003287
M3 - Article
AN - SCOPUS:0036553512
SN - 0218-625X
VL - 9
SP - 1023
EP - 1027
JO - Surface Review and Letters
JF - Surface Review and Letters
IS - 2
ER -