Oxygen ordering in the high-T_c superconductor HgBa_2CaCu_2O_(6+δ) as revealed by perturbedangular correlation

T. M. Mendonca; J. G. Correia; H. HaasP. OdierP. B. TavaresM. R. da SilvaA. M. L. LopesA. M. PereiraJ. N. GoncalvesJ. S. AmaralC. DarieJ. P. Araujo

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Oxygen ordering in the high-T_c superconductor HgBa_2CaCu_2O_(6+δ) as revealed by perturbedangular correlation

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Lattice sites and collective ordering of oxygen atoms in HgBa_2CaCu_2O_(6+δ) were studied using the perturbed angular correlation (PAC) technique at ISOLDE/CERN. The electric field gradients (EFG) at 199' Hg nuclei have been measured as functions of oxygen doping on the Hg planes, above and below T. 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_(2δ) dumbbell molecules are located at the center of the Hg mesh. On the other side, at high concentrations, O_(2δ) dumbbell molecules coexist with single O__δ, 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.

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《Physical review, B. Condensed matter and materials physics》 |2011年第9期|094524:1-094524:10|共10页
作者
T. M. Mendonca; J. G. Correia; H. HaasP. OdierP. B. TavaresM. R. da SilvaA. M. L. LopesA. M. PereiraJ. N. GoncalvesJ. S. AmaralC. DarieJ. P. Araujo;
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作者单位

Institut Neel, CNRS, Avenue des Martyrs 25, F-38042 Grenoble Cedex 9, France;

Centro de Quimica-Vila Real, Departamento de Quimica, Universidade de Tras-os-Montes e Alto Douro, P-5001-911 Vila Real, Portugal;

Centro de Fisica Nuclear da Universidade de Lisboa, Avenida Prof. Gama Pinto 2, P-1649-002 Lisboa, PortugalIFIMUP and IN-Institute of Nanosciences and Nanotechnologies, Rua do Campo Alegre 687, P-4169-007 Porto, PortugalDepartamento de Fisica and CICECO, Universidade de Aveiro, Campus Universitório de Santiago, P-3810-193 Aveiro, Portugallnstituto Tecnologico e Nuclear, E.N. 10—Apartado 21, P-2686-953 Sacavem, Portugal;

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正文语种英语
中图分类物理学;
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Oxygen; correlation; analysis;

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Oxygen ordering in the high-T_c superconductor HgBa_2CaCu_2O_(6+δ) as revealed by perturbedangular correlation

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