Physics – Condensed Matter – Superconductivity
Scientific paper
2004-05-07
Physics
Condensed Matter
Superconductivity
13 pages, 5 figures, accepted for publication in Journal of Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/16/23/023
The effects of Sr substitution on superconductivity, and more particulary the changes induced in the hole doping mechanism, were investigated in Hg2(Ba1-ySry)2YCu2O8-d by a "bond valence sum" analysis with Sr content from y = 0.0 to y = 1.0. A comparison with CuBa2YCu2O7-d and Cu2Ba2YCu2O8 systems suggests a possible explanation of the Tc enhancement from 0 K for y = 0.0 to 42 K for y = 1.0. The charge distribution among atoms of the unit cell was determined from the refined structure, for y = 0.0 to 1.0. It shows a charge transfer to the superconducting CuO2 plane via two doping channels pi(1) and pi(2), i.e. through O2(apical)-Cu and Ba/Sr-O1 bonds respectively.
Bordet Pierre
Floch S. Le
Odier Ph.
Suard Emmanuelle
Toulemonde Pierre
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