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Data acquisition and Python processing using CAEN Digitizer DT5730S for Perturbed Angular Correlation Spectroscopy: the PACIFIC$^2$ route.
/ Rocha-Rodrigues, Pedro (Institute of Physics for Advanced Materials, Nanotechnology, and Photonics (IFIMUP), Faculty of Sciences and Technology of the University of Porto, 4169- 007 Porto, Portugal) ; Lopes, Armandina (Institute of Physics for Advanced Materials, Nanotechnology, and Photonics (IFIMUP), Faculty of Sciences and Technology of the University of Porto, 4169- 007 Porto, Portugal) ; Schell, Juliana (EP Department, ISOLDE-CERN, CH-1211 Geneva 23, Switzerland and Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany)
CERN-INTC-2024-035 ; INTC-I-276.
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2024.
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Local study of Lithium Niobate domain walls
/ Heiniger-Schell, Juliana (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Guerlich, Hannes (Institute of Applied Physics, Technische Universitaet Dresden, 01062 Dresden, Germany) ; Dang, Thien (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Yap, Ian (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Doerschel, Bjoern (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Seddon, Samuel (Institute of Applied Physics, Technische Universitaet Dresden, 01062 Dresden, Germany) ; Koppitz, Boris (Institute of Applied Physics, Technische Universitaet Dresden, 01062 Dresden, Germany) ; Lopes, Armandina (Institute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), 4169 - 007 Porto) ; Carbonari, Artur (Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, São Paulo 05508-000, Brazil) ; Lima, Nicole (Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, São Paulo 05508-000, Brazil) et al.
CERN-INTC-2024-034 ; INTC-P-703.
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2024.
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MULTIPAC-Setup for Perturbed Angular Correlation Experiments in Multiferroic (and Magnetic) Materials: proof-of-concept
/ Schell, Juliana (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland and Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Lupascu, Doru (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Dang, Thien (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Yap, Ian (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Escobar, Marianela (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Schmuck, Merlin (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Haas, Heinz (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland and Department of Physics and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal) ; Johnston, Karl (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland) ; Kowalska, Magdalena (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland) ; Carbonari, Artur (Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, São Paulo 05508-000, Brazil) et al.
CERN-INTC-2023-012 ; INTC-I-249.
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2023.
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Contactless doping characterization of ${\mathrm{Ga}_{2}\mathrm{O}_{3}}$ using acceptor Cd probes
/ Barbosa, Marcelo B (Porto U. ; Singapore Natl. U.) ; Correia, João Guilherme (IST/ITN, Lisbon ; CERN) ; Lorenz, Katharina (Lisbon, IST) ; Lopes, Armandina M L (Porto U.) ; Oliveira, Gonçalo N P (Porto U.) ; Fenta, Abel S (CERN ; Aveiro U. ; Leuven U.) ; Schell, Juliana (CERN ; U. Duisburg-Essen) ; Teixeira, Ricardo (IST, Lisbon (main)) ; Nogales, Emilio (Madrid U.) ; Méndez, Bianchi (Madrid U.) et al.
Finding suitable p-type dopants, as well as reliable doping and characterization methods for the emerging wide bandgap semiconductor $\beta$-${\mathrm{Ga}_{2}\mathrm{O}_{3}}$ could strongly influence and contribute to the development of the next generation of power electronics. In this work, we combine easily accessible ion implantation, diffusion and nuclear transmutation methods to properly incorporate the Cd dopant into the $\beta$-${\mathrm{Ga}_{2}\mathrm{O}_{3}}$ lattice, being subsequently characterized at the atomic scale with the Perturbed Angular Correlation (PAC) technique and Density Functional Theory (DFT) simulations. [...]
2022 - 9 p.
- Published in : Sci. Rep. 12 (2022) 14584
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Group Theory Analysis to Study Phase Transitions of Quasi-2D Sr$_{3}$Hf$_{2}$O$_{7}$
/ Lora da Silva, Estelina (Porto U.) ; Gerami, Adeleh Mokhles (IPM, Tehran ; CERN) ; Neenu Lekshmi, P (Porto U.) ; Marcondes, Michel L (Sao Paulo U.) ; Assali, Lucy V C (Sao Paulo U.) ; Petrilli, Helena M (Sao Paulo U.) ; Correia, Joao Guilherme (CERN ; Lisbon U.) ; Lopes, Armandina M L (Porto U.) ; Araújo, João P (Porto U.)
We present an $ab-initio$ study performed in the framework of density functional theory, group-subgroup symmetry analysis and lattice dynamics, to probe the octahedral distortions, which occur during the structural phase transitions of the quasi-2D layered perovskite Sr$_{3}$Hf$_{2}$O$_{7}$ compound. Such a system is characterized by a high-temperature I4/mmm centrosymmetric structure and a ground-state Cmc21 ferroelectric phase. [...]
2021 - 16 p.
- Published in : Nanomaterials 11 (2021) 897
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Ca$_2$MnO$_4$ structural path: Following the negative thermal expansion at the local scale
/ Rocha-Rodrigues, Pedro (Porto U.) ; Santos, Samuel S M (Porto U.) ; Oliveira, Gonçalo N P (Porto U.) ; Leal, Tiago (Porto U.) ; Miranda, Ivan P (Sao Paulo U.) ; dos Santos, António M (ORNL, Oak Ridge (main)) ; Correia, João G (Lisbon, IST) ; Assali, Lucy V C (Sao Paulo U.) ; Petrilli, Helena M (Sao Paulo U.) ; Araújo, João P (Porto U.) et al.
The oxygen octahedral rotations in Ca$_2$MnO$_4$, the first member of the $\textrm{Ca O ( CaMnO}_3)_n$ Ruddlesden-Popper family, is probed through a set of complementary techniques, including temperature-dependent neutron and x-ray diffraction, combined with local probe studies and ab initio calculations. Here we demonstrate the enhancement of the uniaxial negative thermal expansion coefficient from $-1.26 \pm 0.25$ to $-21 \pm 1.8$ ppm/K at the second order $I4_1/acd$ to $I4/mmm$ structural phase transition, providing direct evidence for the corkscrew atomic mechanism. [...]
2020 - 9 p.
- Published in : Phys. Rev. B 102 (2020) 104115
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Probing Energy Efficient Perovskites
/ Lopes, Armandina (Institute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP), 4169 - 007 Porto) ; Schell, Juliana (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), Duisburg-Essen University, 45141 Essen and European Organization for Nuclear Research (CERN), CH-1211 Geneva)
CERN-INTC-2020-059 ; INTC-P-575.
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2020.
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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
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Perturbed angular correlations studies in the HgBa$_2$CaCu$_2$O$_{6+\delta}$ high-T$_c$ superconductor
/ 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.)
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. [...]
CERN-OPEN-2014-021.-
Geneva : CERN, 2011 - 4 p.
- Published in : J. Supercond. Novel Magn. 24 (2011) 1153-1156
Preprint: PDF;
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