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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.
- 2024.
Fulltext
2.
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.
- 2024.
Fulltext
3.
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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