Hole distribution in (Sr,Ca,Y,La){sub 14}Cu{sub 24}O{sub 41} ladder compounds studied by x-ray absorption spectroscopy
- and others
The unoccupied electronic structure for the Sr{sub 14}Cu{sub 24}O{sub 41} family of two-leg ladder compounds was investigated for different partial substitutions of Sr{sup 2+} by Ca{sup 2+}, leaving the nominal hole count constant, and by Y{sup 3+} or La{sup 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{sub 14}Cu{sub 24}O{sub 41}. On substitution of Ca for Sr orbitals within the ladder planes but perpendicular to the legs receive some hole occupation as well.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205657
- Journal Information:
- Physical Review B, Vol. 62, Issue 21; Other Information: Othernumber: PRBMDO000062000021014384000001; 132041PRB; PBD: 1 Dec 2000; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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