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CERN Document Server Намерени са 2,050 записа  1 - 10следващкрай  отиване на запис: Търсенето отне 0.51 секунди. 
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Room-Temperature $^{181}$Ta(TiO$_2$): An e-γ TDPAC Study / Yap, Ian Chang Jie (Gottingen U., II. Phys. Inst.) ; Schell, Juliana (CERN ; Duisburg-Essen U.) ; Dang, Thien Thanh (Duisburg-Essen U.) ; Noll, Cornelia (Bonn U., HISKP) ; Beck, Reinhard (Bonn U., HISKP) ; Köster, Ulli (Laue-Langevin Inst.) ; Mansano, Ronaldo (Sao Paulo U.) ; Hofsäss, Hans Christian (Gottingen U., II. Phys. Inst.)
In this work, we report on the hyperfine parameters of the foreign 181Ta probe in the rutile structure of the single crystal TiO2 using the e−γ and γ−γ time differential perturbed angular correlation (TDPAC) technique. We implanted 181Hf ions into a sample of single crystal rutile TiO2 in the Bonn Isotope Separator. [...]
2022 - 31 p. - Published in : Crystals 12 (2022) 946 Fulltext: PDF;
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Part 1: A particular EFG temperature dependence for $^{181}\textbf{(TiO}_2)$: An electron-gamma TDPAC study. / Yap, Ian Chang Jie
The hyperfine parameters of the $^{181}$Ta trace impurities in the rutile structure of the TiO$_2$ single crystals (denoted 181Ta(TiO2)) are studied mainly using the time differential e-γ perturbed angular correlation (e-γ TDPAC) technique by the ion-implanted $^{181}$Hf tracers that decays to 1 [...]
CERN-THESIS-2022-405 - 142.

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Ion implantation in titanium dioxide thin films studied by perturbed angular correlations / Schell, Juliana (CERN ; U. Duisburg-Essen) ; Lupascu, Doru C (U. Duisburg-Essen) ; Carbonari, Artur Wilson (IPEN, Sao Paulo) ; Domingues Mansano, Ronaldo (Polytechnic School, University of São Paulo) ; Souza Ribeiro Junior, Ibere (IPEN, Sao Paulo) ; Dang, Thien Thanh (Bonn U., HISKP) ; Anusca, Irina (U. Duisburg-Essen) ; Trivedi, Harsh (U. Duisburg-Essen) ; Johnston, Karl (CERN) ; Vianden, Reiner (Bonn U., HISKP)
The local environment in titanium dioxide was studied by the time dependent perturbed $\gamma\gamma$ angular correlation of $^{111}In/^{111}Cd$ and $^{181}Hf/^{181}Ta$ at the Helmholtz-Institut fur Strahlen-und Kernphysik, Bonn. An introduction to the implantation methodologies performed at the Bonn Radioisotope Separator is presented. [...]
2017 - 8 p. - Published in : J. Appl. Phys. 121 (2017) 145302
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4.
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Implantation of cobalt in SnO2 thin films studied by TDPAC / Schell, Juliana (CERN ; U. Duisburg-Essen) ; Lupascu, Doru C (U. Duisburg-Essen) ; Carbonari, Artur Wilson (IPEN, Sao Paulo) ; Mansano, Ronaldo Domingues (U. Sao Paulo (main)) ; Dang, Thien Thanh (Bonn U., HISKP) ; Vianden, Reiner (Bonn U., HISKP)
Here we report time differential perturbed angular correlation (TDPAC) results of Co-doped SnO2 thin films. Making use of stable Co and radioactive 111In implanted at the Bonn Radioisotope Separator with energies of 80 keV and 160 keV, respectively, it was possible to study the dopant incorporation and its lattice location during annealing. [...]
2017 - 6 p. - Published in : AIP Adv. 7 (2017) 055304 Fulltext: PDF;
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Perturbed Angular Correlation Technique at ISOLDE/CERN Applied for Studies of Hydrogenated Titanium Dioxide (TiO2): Observation of Cd-H Pairs / Zyabkin, Dmitry V (Ilmenau Tech. U.) ; Schell, Juliana (CERN ; Duisburg-Essen U.) ; Correia, João G M (CERN ; IST/ITN, Lisbon) ; Vetter, Ulrich (Ilmenau Tech. U.) ; Schaaf, Peter (Ilmenau Tech. U.)
Profound understanding of the local electronic and defect structure in semiconductors always plays a vital role in the further developing of applications of such materials. In the present work an investigation of the electronic structure in hydrogenated TiO2 (rutile) thin films is conducted by virtue of Time-Differential γ-γ Perturbed Angular Correlation spectroscopy (TDPAC or PAC) with 111mCd/Cd isotope, produced and implanted at ISOLDE/CERN. [...]
2022 - 10 p. - Published in : Crystals 12 (2022) 756 Fulltext: PDF;
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Temperature dependence of the local electromagnetic field at the Fe site in multiferroic bismuth ferrite / Dang, T T (U. Duisburg-Essen) ; Schell, J (U. Duisburg-Essen ; CERN) ; Boa, A G (Denmark, Tech. U.) ; Lewin, D (U. Duisburg-Essen) ; Marschick, G (TU Vienna) ; Dubey, A (U. Duisburg-Essen) ; Escobar-Castillo, M (Duisburg-Essen U.) ; Noll, C (Bonn U., HISKP) ; Beck, R (Bonn U., HISKP) ; Zyabkin, Dmitry V (Ilmenau Tech. U.) et al.
In this paper, we present a study of the temperature-dependent characteristics of electromagnetic fields at the atomic scale in multiferroic bismuth ferrite (BiFeO$_3$ or BFO). The study was performed using time differential perturbed angular correlation (TDPAC) spectroscopy on implanted 111In (111Cd) probes over a wide temperature range. [...]
2022 - 15 p. - Published in : Phys. Rev. B 106 (2022) 054416 Fulltext: PDF;
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Thermal annealing effects in polycrystalline EuTiO$_{3}$ and Eu$_{2}$Ti$_{2}$O$_{7}$ / IS611 Collaboration
Using time-differential perturbed angular correlation ofγrays, we investigated the electric-field gradient of polycrystalline EuTiO$_{3}$ and Eu$_{2}$Ti$_{2}$O$_{7}$, with $^{181}$Hf($^{181}$Ta) as a probe, following different thermal treatments. The measurements were performed at ISOLDE-CERN fol-lowing 80 keV implantation at the Bonn Radioisotope Separator. [...]
2019 - 8 p. - Published in : AIP Adv. 9 (2019) 125125 Fulltext: PDF;
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Cd and In-doping in thin film SnO2 / Schell, Juliana (CERN ; Duisburg-Essen U.) ; Lupascu, Doru C (Duisburg-Essen U.) ; Wilson Carbonari, Artur (Sao Paulo U., FFCLRP) ; Domingues Mansano, Ronaldo (Sao Paulo U., FFCLRP) ; S Freitas, Rafael (Sao Paulo U., FFCLRP) ; Nuno Gonçalves, João (Aveiro U.) ; Thanh Dang, Thien (Bonn U.) ; Vianden, Reiner (Bonn U.)
In this paper, we investigate the effects of doping in the local structure of SnO2 by measuring the hyperfine interactions at impurity nuclei using the Time Differential Perturbed Gamma-Gamma Angular Correlation (TDPAC) method in addition to density functional theory simulations. The hyperfine field parameters have been probed as a function of the temperature in thin film samples. [...]
2017 - 5 p. - Published in : J. Appl. Phys. 121 (2017) 195303 Fulltext: PDF;
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Dynamic quadrupole interactions in semiconductors / Dang, Thien Thanh (Bonn U., HISKP) ; Schell, Juliana (CERN ; U. Duisburg-Essen) ; Lupascu, Doru C (Duisburg U. ; U. Duisburg-Essen) ; Vianden, Reiner (Bonn U., HISKP)
The time differential perturbed angular correlation, TDPAC, technique has been used for several decades to study electric quadrupole hyperfine interactions in semiconductors such as dynamic quadrupole interactions (DQI) resulting from after-effects of the nuclear decay as well as static quadrupole interactions originating from static defects around the probe nuclei such as interstitial ions, stresses in the crystalline structure, and impurities. Nowadays, the quality of the available semiconductor materials is much better, allowing us to study purely dynamic interactions. [...]
2018 - 9 p. - Published in : J. Appl. Phys. 123 (2018) 165109-1 - 165109-9
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Investigation of the local environment of SnO$_{2}$ in an applied magnetic field / Schell, J (CERN ; U. Duisburg-Essen) ; Dang, T T (U. Duisburg-Essen ; Bonn U., HISKP) ; Zyabkin, D V (Ilmenau Tech. U. ; Palacky U.) ; Mansano, R D (Sao Paulo U.) ; Gaertner, D (Munster U.) ; Carbonari, A W (IPEN, Sao Paulo)
This paper presents the results of time-differential perturbed gamma–gamma angular correlation measurements of SnO$_{2}$ thin films carried out in an applied magnetic field. The measurements were performed upon the implantation of Fe at 80 keV and $^{111}$In($^{111}$Cd) at 160 keV. [...]
2020 - Published in : Physica B: Physics of Condensed Matter 586 (2020) 412120 Fulltext: PDF;
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