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Temperature Dependence of the Hyperfine Magnetic Field at Fe Sites in Ba-Doped BiFeO$_3$ Thin Films Studied by Emission Mössbauer Spectroscopy
/ Heiniger-Schell, Juliana (CERN ; Duisburg-Essen U.) ; Bharuth-Ram, Krish (ENS, Lyon, Lab. Phys. ; KwaZulu Natal U. ; DUT, Durban) ; Naicker, Kimara (ENS, Lyon, Lab. Phys. ; KwaZulu Natal U.) ; Masondo, Vusumuzi (DUT, Durban) ; Dang, Thien Thanh (Duisburg-Essen U.) ; Escobar, Marianela (Duisburg-Essen U.) ; Díaz-Guerra, Carlos (Madrid U.) ; Marschick, Georg (Vienna, Tech. U.) ; Masenda, Hilary (Witwatersrand U.) ; Gunnlaugsson, Haraldur P (Iceland U.) et al.
Emission $^{57}$Fe Mössbauer spectroscopy (eMS), following the implantation of radioactive $^{57}$Mn+ ions, has been used to study the temperature dependence of the hyperfine magnetic field at Fe sites in Ba-doped BiFeO$_3$ (BFO) thin films. $^{57}$Mn β decays (t$_{1/2}$ = 90 s) to the 14.4 keV Mössbauer state of $^{57}$Fe, thus allowing online eMS measurements at a selection of sample temperatures during Mn implantation. [...]
2023 - 13 p.
- Published in : Crystals 13 (2023) 724
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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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Anisotropy of the Electric Field Gradient in Two-Dimensional α-MoO$_3$ Investigated by $^{57}$Mn($^{57}$Fe) Emission Mössbauer Spectroscopy
/ Schell, Juliana (CERN ; Duisburg-Essen U.) ; Zyabkin, Dmitry (Ilmenau Tech. U.) ; Bharuth-Ram, Krish (KwaZulu Natal U.) ; Gonçalves, João N (Aveiro U.) ; Díaz-Guerra, Carlos (Madrid U.) ; Gunnlaugsson, Haraldur P (Iceland U.) ; Martín-Luengo, Aitana Tarazaga (Linz U.) ; Schaaf, Peter (Ilmenau Tech. U.) ; Bonanni, Alberta (Linz U.) ; Masenda, Hilary (Witwatersrand U. ; Philipps U. Marburg) et al.
Van der Waals α-MoO3 samples offer a wide range of attractive catalytic, electronic, and optical properties. We present herein an emission Mössbauer spectroscopy (eMS) study of the electric-field gradient (EFG) anisotropy in crystalline free-standing α-MoO3 samples. [...]
2022 - 13 p.
- Published in : Crystals 12 (2022) 942
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Confirming the Unusual Temperature Dependence of the Electric-Field Gradient in Zn
/ Haas, Heinz (Aveiro U. ; CERN) ; Zyabkin, Dmitry (Ilmenau Tech. U.) ; Schell, Juliana (CERN ; Duisburg-Essen U.) ; Dang, Thien T (Duisburg-Essen U.) ; Yap, Ian C J (Gottingen U., II. Phys. Inst.) ; Michelon, Ilaria (Padua U.) ; Gaertner, Daniel (Munster U.) ; Gerami, Adeleh Mokhles (IPM, Tehran) ; Noll, Cornelia (Bonn U.) ; Beck, Reinhard (Bonn U.)
The electric-field gradient (EFG) at nuclei in solids is a sensitive probe of the charge distribution. Experimental data, which previously only existed in insulators, have been available for metals with the development of nuclear measuring techniques since about 1970. [...]
2022 - 8 p.
- Published in : Crystals 12 (2022) 1064
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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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Investigation of Metal Ions Drift in Memristive Devices using Perturbed Angular Correlation (PAC) method
/ Mokhles Gerami, Adeleh (School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), Tehran P.O. Box 19395-5531, Iran) ; Schaaf, Peter (Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering, Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, Gustav-Kirchhoff-Strasse 5, 98693 Ilmenau, Germany) ; 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) ; Blum, Michaela (Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering, Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, Gustav-Kirchhoff-Strasse 5, 98693 Ilmenau, Germany) ; Mohammadi, Bahar (School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), Tehran P.O. Box 19395-5531, Iran) ; Dang, Thien Thanh (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Yap, I C J (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Johnston, Karl (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland) ; Carbonari, A W (Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, São Paulo 05508-000, Brazil) ; Correa, B S (Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, São Paulo 05508-000, Brazil) et al.
CERN-INTC-2023-013 ; INTC-I-250.
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2023.
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Towards in vivo applications of 111Ag perturbed angular correlation of γ-rays (PAC) spectroscopy
/ Tosato, Marianna (U. Padua (main)) ; Asti, Mattia ; Di Marco, Valerio (U. Padua (main)) ; Jensen, Marianne L (Bohr Inst.) ; Schell, Juliana (CERN ; U. Duisburg-Essen) ; Dang, Thien Thanh (U. Duisburg-Essen) ; Köster, Ulli (Laue-Langevin Inst.) ; Jensen, Mikael (Denmark, Tech. U.) ; Hemmingsen, Lars (U. Copenhagen (main))
$^{111}$Ag-perturbed angular correlation of γ-rays (PAC) spectroscopy provides information on the nuclear quadrupole interactions, and thereby on the local structure and dynamics of the silver ion binding site. Brownian rotational motion, i.e. [...]
2022 - 8 p.
- Published in : Appl. Radiat. Isot. 190 (2022) 110508
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Tracer diffusion and PAC measurements of 111mCd tracer atoms in A3B compounds
/ Divinski, Sergiy (Institute of Materials Physics, University of Münster, Germany) ; Gaertner, Daniel (Institute of Materials Physics, University of Münster, Germany) ; Collins, Gary (Pullman Professor of Physics, Washington State University (WSU), Pullman, WA, USA) ; Zacate, Matthew (Physics and Geology Department, Northern Kentucky University Highland Heights, KY, USA) ; Schell, Juliana (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE)) ; Johnston, Karl (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland) ; Dang, Thien Thanh (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE)) ; Lupascu, Doru C (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE)) ; Hickel, T (Department of Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany and BAM Bundesanstalt für Materialforschung und -Prüfung, Richard-Willstätter-Str. 11, 12489 Berlin, Germany)
CERN-INTC-2022-014 ; INTC-P-626.
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2022.
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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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