Journal
PHYSICAL REVIEW B
Volume 79, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.214517
Keywords
antiferromagnetism; calcium compounds; charge transfer states; doping; electron energy loss spectra; electronic structure; excitons; high-temperature superconductors; sodium compounds
Funding
- MEXT of Japan [17105002, 19014010, 19340098]
- DFG [FOR 538, KN393/13]
- Grants-in-Aid for Scientific Research [19340098, 17105002, 19014010] Funding Source: KAKEN
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Employing electron energy-loss spectroscopy we show that small values of doping in the system Ca2-xNaxCuO2Cl2 strongly influence the formation of charge-transfer excitons in the Cu-O plane. We find a remarkable redistribution of spectral weight between the two modes-a bound exciton and a continuum state-seen in the insulator yielding a single sharp feature for nonzero doping accompanied by a strong suppression of the dispersion. Our data may provide evidence for a prominent role of the magnetic background on the dynamics of charge-transfer excitations in underdoped cuprates.
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