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1.
Oxygen ordering in the high-T$_c$ superconductor HgBa$_2$CaCu$_2$O$_{6+\delta}$ as revealed by perturbed angular correlation / Mendonca, Tania Melo (Neel Lab, Grenoble ; Porto U.) ; Correia, Joao Guilherme (ITN, Sacavem ; Lisbon U., CFNUL) ; 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) ; Pereira, Andre (Porto U.) ; Goncalves, Joao Nuno (U. Aveiro) ; Amaral, Joao (U. Aveiro) et al.
Lattice sites and collective ordering of oxygen atoms in HgBa$_2$CaCu$_2$O$_{6+\delta}$ 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$_c$. [...]
CERN-OPEN-2014-022.- Geneva : CERN, 2011 - 10 p. - Published in : Phys. Rev. B 84 (2011) 094524 Preprint: PDF;
2.
Dynamic off-centering of Cr$^{3+}$ ions and short-range magneto-electric clusters in in CdCr$_2$S$_4$ / Oliveira, Gonçalo Nuno (Porto U.) ; Pereira, André Miguel (Porto U.) ; Lopes, Armandina Lima (Lisbon U., CFNUL) ; Amaral, João Sequeira (Aveiro U.) ; dos Santos, António (Oak Ridge) ; Ren, Yan (ANL, APS) ; Mendonca, Tania Manuela (Porto U.) ; Sousa, Célia Tavares (Porto U.) ; Amaral, Vitor Sequeira (Aveiro U.) ; Correia, João Guilherme (IST/ITN, Lisbon) et al.
The cubic spinel CdCr$_2$S$_4$ gained recently a vivid interest, given the relevance of relaxor-like dielectric behavior in its paramagnetic phase. By a singular combination of local probe techniques namely Pair Distribution Function and Perturbed Angular Correlation we firmly establish that the Cr ion plays the central key role on this exotic phenomenon, namely through a dynamic off-centering displacement of its coordination sphere. [...]
CERN-OPEN-2014-019.- Porto : IFIMUP-IN, 2012 - 7 p. - Published in : Phys. Rev. B 86 (2012) 224418 Preprint: PDF;

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