Orbital structure of copper in high temperature superconductors

✍ Scribed by D.I. Khomskii; E.I. Neimark

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 462 KB
• Volume: 173
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)90734-g

✦ Synopsis

The orbital structure of copper ions in high-T, cuprates is discussed in a localized picture. Experimental indications that the d,j-orbital becomes relevant, especially at high doping levels, are summarized.

The possible mechanism of this effect, notably the crossing of d,I_,z and d,Aevels with doping, is identified and corresponding numerical calculations are carried out. It is shown that e.g. for La_>r,CuO, the crossing of these levels may occur at xw 0.4. The consequences of this phenomenon for the stability of the system and for its superconductivity are briefly discussed.