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The Local Exploration of Magnetic Field Effects in Semiconductors
/ Dang, Thien Thanh (Duisburg-Essen U.) ; Schell, Juliana (Duisburg-Essen U. ; CERN) ; Beck, Reinhard (Bonn U.) ; Noll, Cornelia (Bonn U.) ; Lupascu, Doru C (Duisburg-Essen U.)
This study reports on the local exploration of magnetic field effects in semiconductors, including silicon (Si), germanium (Ge), gallium arsenide (GaAs), and indium phosphide (InP) using the time differential perturbed angular correlation (TDPAC) technique. TDPAC measurements were carried out under external magnetic fields with strengths of 0.48 T and 2.1 T at room temperature, and 77 K following the implantation of 111In (111Cd) probes. [...]
2022 - 11 p.
- Published in : Crystals 12 (2022) 560
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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
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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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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
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TDPAC Studies of Local Defects and Phenomena in Ferroics and Multiferroics
/ Schell, Juliana (CERN ; Duisburg-Essen U.) ; Marschick, Georg (CERN ; TU Vienna)
We provide an overview of time-differential perturbed angular correlation (TDPAC) measurements of ferroic and multiferroic materials. Here, we explore chalcogenide spinels, lead titanate, lead zirconate, and bismuth ferrite, describing the use of TDPAC experiments to probe the physics of localized defects and the various mechanisms that govern electronic and magnetic interactions, the coupling of the associated degrees of freedom, and the structural, charge, and orbital correlations for these materials..
2019 - 13 p.
- Published in : Crystals 9 (2019) 611
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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
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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
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Strong magnetoelectric coupling at an atomic nonmagnetic electromagnetic probe in bismuth ferrite
/ Schell, Juliana (CERN ; Duisburg-Essen U.) ; Schmuck, Merlin (Duisburg-Essen U.) ; Efe, İpek (Zurich, ETH) ; Dang, Thien Thanh (Duisburg-Essen U.) ; Gonçalves, João Nuno (Aveiro U.) ; Lewin, Daniil (Duisburg-Essen U.) ; Castillo, Marianela Escobar (Duisburg-Essen U.) ; Shvartsman, Vladimir V (Duisburg-Essen U.) ; Costa, Ângelo Rafael Granadeiro (CERN ; Lisbon, IST) ; Köster, Ulli (Laue-Langevin Inst.) et al.
Isolated nonmagnetic substitutional defect ions experience huge coupled electric magnetic interaction in the single-phase multiferroic BiFeO$_{3}$. In the ferroelectric state above the magnetic Néel temperature $T$$_{N}$, the electric environment generates a single symmetric electric field gradient (EFG) parallel to the electric polarization direction. [...]
2022 - 13 p.
- Published in : Phys. Rev. B 105 (2022) 094102
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