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  • Title: Charge ordering fluctuation and optical pseudogap in La(1-x)Ca(x)MnO(3).
    Author: Kim KH, Lee S, Noh TW, Cheong SW.
    Journal: Phys Rev Lett; 2002 Apr 22; 88(16):167204. PubMed ID: 11955259.
    Abstract:
    Optical spectroscopy was used to investigate the optical gap ( 2 Delta) due to charge ordering (CO) and related pseudogap developments with x and temperature ( T) in La(1-x)Ca(x)MnO(3) ( 0.48< or =x< or =0.67). Surprisingly, we found 2 Delta/k(B)T(CO) is as large as 30 for x approximately 0.5, and decreases rapidly with increasing x. Simultaneously, the optical pseudogap, possibly starting from T* far above T(CO) becomes drastically enhanced near x = 0.5, producing non-BCS T-dependence of 2 Delta with the large magnitude far above T(CO), and systematic increase of T* for x approximately 0.5. These results unequivocally indicate systematically enhanced CO correlation when x approaches 0.5 even though T(CO) decreases.
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