Influence of Sr substitution on the structure, charge distribution, and critical temperature of Y(Ba1-xSrx)(2)Cu4O8 single crystalsстатья

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[1] Influence of sr substitution on the structure, charge distribution, and critical temperature of y(ba1-xsrx)(2)cu4o8 single crystals / J. Karpinski, S. M. Kazakov, M. Angst et al. // Physical Review B - Condensed Matter and Materials Physics. — 2001. — Vol. 64, no. 9. — P. 094518. We have investigated the influence of substitution of Sr for Ba on the structure, charge distribution. and T-c in the YBa2Cu4O8 (Y124) compound. Bond valence sum and nuclear quadrupole resonance investigations show that the substitution of Sr causes a redistribution of charge in the structure. The number of holes located in plane copper (Cu2) and apical oxygen (O1) increases. hence the number of holes in chain copper (Cu1) and plane oxygen (O2 and O3) decreases. A redistribution of holes from Cu1 to O1 and from O2 and O3 to Cu2 takes place. The literature data for Y123 and the hydrostatic pressure effect on both Y124 and Y123 compounds show that oxygen doping in Y123 and the pressure effect in Y124 increase the hole number equally on copper and oxygen. Therefore, although the number of holes on copper Cu2 in the CuO2 planes increases with Sr doping in both Y124 and Y123. T-c does not rise as much as expected from the amount of charge transferred to Cu2. because of their distribution in the CuO2 planes. [ DOI ]

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