Optical Study of the Sr{sub 14-{ital x}}Ca{sub x}Cu{sub 24}O{sub 41} System: Evidence for Hole-Doped Cu{sub 2}O{sub 3} Ladders
Journal Article
·
· Physical Review Letters
- Department of Superconductivity, The University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)
The optical conductivity spectrum of Sr{sub 14-x}Ca{sub x}Cu{sub 24}O{sub 41}, composed of two-leg Cu{sub 2}O{sub 3} ladders and edge-sharing CuO{sub 2} chains, is investigated on single crystals with various compositions. Upon isovalent Ca substitution for Sr a rapid transfer of the spectral weight takes place from the high- to low-energy region, essentially in the same manner as that observed in the doped CuO{sub 2} planes of high-T{sub c} cuprates. We identify this behavior as a consequence of charge redistribution between chains and ladders, and estimate the hole density in each structural unit from the transferred spectral weight. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 510630
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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