Control of hole distribution through isovalent R-cation substitution in Cu[sub 2]Ba[sub 2]RCu[sub 2]O[sub 8] superconductors
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© 2007 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics. The following article appeared in Applied Physics Letters. Volume 90, Issue 3 and may be found at http://scitation.aip.org/content/aip/journal/apl/90/3/10.1063/1.2431458.
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School of Chemical Technology |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2007
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Language
en
Pages
032511/1-3
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Applied Physics Letters, Volume 90, Issue 3
Abstract
Superconductive Cu2Ba2RCu2O8 samples with R ranging from Gd to Tm have been synthesized through a sol-gel route. Both iodometric titration and CuL-edge x-rayabsorption 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 XANESspectra, 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.Description
Keywords
superconductors, copper
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Citation
Karppinen, Maarit & Abe, Y. & Grigoraviciute, I. & Chen, J. M. & Liu, R. S. & Yamauchi, H. 2007. Control of hole distribution through isovalent R-cation substitution in Cu[sub 2]Ba[sub 2]RCu[sub 2]O[sub 8] superconductors. Applied Physics Letters. Volume 90, Issue 3. 032511/1-3. ISSN 0003-6951 (printed). DOI: 10.1063/1.2431458.