Control of hole distribution through isovalent R-cation substitution in Cu2Ba2RCu2O8 superconductors

Maarit Karppinen, Y. Abe, I. Grigoraviciute, J.M. Chen, R.S. Liu, H. Yamauchi

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    Abstract

    Superconductive Cu2Ba2RCu2O8 samples with R ranging from Gd to Tm have been synthesized through a sol-gel route. Both iodometric titration and Cu L-edge x-ray absorption near-edge structure (XANES) spectroscopy data indicate that the average Cu valence remains constant, whereas Tc increases with decreasing size of the R constituent. An explanation for this trend is revealed from O K-edge XANES spectra, which show that the smaller-for-larger R-cation substitution results in a shift of holes from the Cu2O2 charge reservoir to the superconductive CuO2 planes. Since Cu2Ba2RCu2O8 samples are underdoped, such a shift of holes raises the value of Tc.
    Original languageEnglish
    Article number032511
    Pages (from-to)1-3
    JournalApplied Physics Letters
    Volume90
    Issue number3
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

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