| Article | |
| Report number | CERN-OPEN-2014-021 |
| Title | Perturbed angular correlations studies in the HgBa$_2$CaCu$_2$O$_{6+\delta}$ high-T$_c$ superconductor |
| Author(s) | Mendonca, Tania Melo (Porto U.) ; Correia, Joao Guilherme (ITN, Sacavem) ; Haas, Heinz (ITN, Sacavem) ; Odier, Philippe (Neel Lab, Grenoble) ; Tavares, Pedro (UTAD, Vila Real) ; SIlva, Manuel Ribeiro (Lisbon U., CFNUL) ; Lopes, Armandina (Lisbon U., CFNUL) ; Darie, Celine (Neel Lab, Grenoble) ; Araujo, Joao Pedro (Porto U.) |
| Publication | 2011 |
| Imprint | 17 Jan 2014 |
| Number of pages | 4 |
| In: | J. Supercond. Novel Magn. 24 (2011) 1153-1156 |
| DOI | 10.1007/s10948-010-1099-8 |
| Subject category | Condensed Matter |
| Accelerator/Facility, Experiment | CERN ISOLDE ; IS487 |
| Free keywords | Hg-based superconductors ; Oxygen ordering ; Local probe techniques |
| Abstract | The electric field gradients at $^{199m}$Hg nuclei have been measured via the perturbed angular correlation (PAC) technique, allowing a full characterization of the Hg neighborhood charge distribution at high oxygen doping on the Hg planes. The PAC technique has been applied to investigate the effect of high oxygen pressure during the measurement. Polycrystalline HgBa$_2$CaCu$_2$O$_{6+\delta}$ (Hg-1212) samples have been annealed at 152 bar pressurized oxygen. The influence of oxygen pressure during the experiment was then investigated by measuring the samples at atmospheric pressure and under 152 bar oxygen pressure. The present set of PAC experiments shows that at high oxygen concentrations there is a non-uniform oxygen distribution. Moreover, the Hg environment is not free from oxygen and the results hint to a new type of ordering. |
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Journalen skapades 2014-01-17, och modifierades senast 2015-05-29
