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- W2000595544 abstract "Lattice sites and collective ordering of oxygen atoms in HgBa${}_{2}$CaCu${}_{2}$O${}_{6+ensuremath{delta}}$ were studied using the perturbed angular correlation (PAC) technique at ISOLDE/CERN. The electric field gradients (EFG) at ${}^{199m}$Hg nuclei have been measured as functions of oxygen doping on the Hg planes, above and below ${T}_{c}$. In comparison with the results obtained for oxygen and fluorine doping in Hg-1201, the analysis shows a different oxygen ordering exhibited by Hg-1212. Moreover, for all studied cases, the experimental results show that at a local scale there is non uniform oxygen distribution. A series of ab initio EFG calculations allowed to infer that at low concentrations, regions without oxygen coexist with regions where O${}_{2ensuremath{delta}}$ dumbbell molecules are located at the center of the Hg mesh. On the other side, at high concentrations, O${}_{2ensuremath{delta}}$ dumbbell molecules coexist with single O${}_{ensuremath{delta}}$ atoms occupying the center of the Hg mesh. The present results suggest that oxygen sits on the Hg planes in the form of a molecule and not as a single atom." @default.
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- W2000595544 date "2011-09-23" @default.
- W2000595544 modified "2023-10-13" @default.
- W2000595544 title "Oxygen ordering in the high-Tcsuperconductor HgBa2CaCu2O6+δas revealed by perturbed angular correlation" @default.
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- W2000595544 doi "https://doi.org/10.1103/physrevb.84.094524" @default.
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