Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-08-22
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages RevTeX style with 7 embedded figures + 1 table; accepted by Phys. Rev. B
Scientific paper
10.1103/PhysRevB.62.14384
The unoccupied electronic structure for the Sr_14Cu_24O_41 family of two-leg ladder compounds was investigated for different partial substitutions of Sr^2+ by Ca^2+, leaving the nominal hole count constant, and by Y^3+ or La^3+, reducing the nominal hole count from its full value of 6 per formula unit. Using polarization-dependent x-ray absorption spectroscopy on single crystals, hole states on both the chain and ladder sites could be studied. While for intermediate hole counts all holes reside on O sites of the chains, a partial hole occupation on the ladder sites in orbitals oriented along the legs is observed for the fully doped compound Sr_14Cu_24O_41. On substitution of Ca for Sr orbitals within the ladder planes but perpendicular to the legs receive some hole occupation as well.
Akimitsu Jun
Ammerahl Udo
Chakarian V.
Conder Kazimierz
Eisaki Hiroshi
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