Phys. Rev. Lett. 78, 1980–1983 (1997)Optical Study of the Sr14-xCaxCu24O41 System: Evidence for Hole-Doped Cu2O3 LaddersReceived 15 October 1996; published in the issue dated 10 March 1997 The optical conductivity spectrum of Sr14-xCaxCu24O41, composed of two-leg Cu2O3 ladders and edge-sharing CuO2 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 CuO2 planes of high- Tc 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. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.1980
DOI:
10.1103/PhysRevLett.78.1980
PACS:
74.72.Jt, 78.20.-e, 78.30.-j
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