Electronic structure of T∗-type Nd1.4Ce0.2Sr0.4CuO4 studied by photoelectron spectroscopy

✍ Scribed by M. Klauda; P. Lunz; J. Markl; J.P. Ströbel; C. Fink; G. Saemann-Ischenko

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 782 KB
• Volume: 191
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90639-t

✦ Synopsis

We present investigations of the electronic structure of T*-type Ndt.4Ceo.zSro.4CuO4 by means of photoelectron spectroscopy. The Cu-O-hybridization for Ndl.4Ce0 :Sro.4CuO4 seems to have a smaller value than in n-doped T'-HTSCs, but is slightly larger than e.g, for Bi2Sr_-CaCu:Os_6, We attribute this to the structural properties of these compounds. On the other hand, the effective Coulomb repulsion on the copper site for'I s is found to be comparable to the electron doped systems. Concerning the mean Nd-O-hybridization within the rare-earth layers only small differences between Ndt.4Ceo.2Sro.4CuO4 and T'-systems are observed. Doped Ce was confirmed to be tetravalent in both T'-and T*.-compounds. The Cu-O-valence band region shows no significant changes compared with other HTSCs.