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Direct evidence of Be as an amphoteric dopant in GaN / Wahl, U. (IST, Lisbon) ; Correia, J. G. (IST, Lisbon) ; Costa, A. R. G. (KU Leuven) ; Lima, T. A. L. (KU Leuven) ; Moens, J. (KU Leuven) ; Kappers, M. J. (Cambridge U.) ; da Silva, M. R. (Aveiro U., CICECO) ; Pereira, L. M. C. (KU Leuven) ; Vantomme, A. (KU Leuven) /IS634 Collaboration
The interest in Be as an impurity in GaN stems from the challenge to understand why GaN can be doped p type with Mg, while this does not work for Be. While theory has actually predicted an acceptor level for Be that is shallower than Mg, it was also argued that Be is not a suitable acceptor because its am-photeric nature, i.e. [...]
2022 - Published in : Phys. Rev. B 105 (2022) 184112 Postprint from Phys. Rev. B 105 (2022) 184112: PDF; Supplemental Material from Phys. Rev. B 105 (2022) 184114: PDF;

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Lattice location study of low-fluence ion-implanted 124In in 3C-SiC / Costa, A. R. G. ; Wahl, U. ; Correia, J. G. ; David-Bosne, E. ; Augustyns, V. ; Lima, T. A. L. ; Silva, D. J. ; da Silva, M. R. ; Bharuth-Ram, K. ; Pereira, L. M. C.
We report on the lattice location of low-fluence ion implanted 124In in single-crystalline 3C-SiC by means of the emission channeling technique using radioactive isotopes produced at the ISOLDE/CERN facility. In the sample implanted at room temperature to a fluence of 4 × 1012 cm−2, 60(9)% of the In atoms were found slightly displaced (0.12–0.20 Å) from substitutional Si sites, with the remainder occupying sites of low crystallographic symmetry, the so-called random sites. [...]
2019 - Published in : Journal of Applied Physics 125 (2019) 215706 Fulltext: PDF;

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Lattice sites of ion-implanted Mn, Fe and Ni in 6H-SiC / Costa, A R G (IST, Lisbon (main)) ; Wahl, U (IST, Lisbon (main)) ; Correia, J G (IST, Lisbon (main)) ; David-Bosne, E (IST, Lisbon (main)) ; Amorim, L M (Leuven U.) ; Augustyns, V (Leuven U.) ; Silva, D J (Porto U., Astron. Dept.) ; da Silva, M R (Lisbon U., CFNUL) ; Pereira, L M C (Leuven U.) /ISOLDE
Using radioactive isotopes produced at the CERN-ISOLDE facility, the lattice location of the implanted transition metal (TM) ions $^56$Mn, $^59$Fe and $^65$Ni in n-type single-crystalline hexagonal 6H-SiC was studied by means of the emission channeling technique. TM probes on carbon coordinated tetrahedral interstitial sites ($T_C$) and on substitutional silicon sites ($S_{Si,h+k}$) were identified. [...]
2017 - 10 p. - Published in : Semicond. Sci. Technol. 33 (2017) 015021 Fulltext: PDF;

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Evidence of tetragonal distortion as the origin of the ferromagnetic ground state in $\gamma$−Fe nanoparticles / Augustyns, V (Leuven U.) ; van Stiphout, K (Leuven U.) ; Joly, V (Leuven U.) ; Lima, T A L (Leuven U.) ; Lippertz, G (Leuven U.) ; Trekels, M (Leuven U.) ; Menéndez, E (Leuven U.) ; Kremer, F (Australian Natl. U., Canberra) ; Wahl, U (IST, Lisbon (main)) ; Costa, A R G (IST, Lisbon (main)) et al. /Isolde
$\gamma$−Fe and related alloys are model systems of the coupling between structure and magnetism in solids. Since different electronic states (with different volumes and magnetic ordering states) are closely spaced in energy, small perturbations can alter which one is the actual ground state. [...]
2017 - Published in : Phys. Rev. B 96 (2017) 174410 Fulltext: PDF;

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The solid state physics programme at ISOLDE: recent developments and perspectives / Johnston, Karl (CERN) ; Schell, Juliana (CERN ; Duisburg-Essen U.) ; Correia, J G (CERN ; IST/ITN, Lisbon) ; Deicher, M (Hamburg U.) ; Gunnlaugsson, H P (Iceland U.) ; Fenta, A S (CERN ; Aveiro U. ; Leuven U.) ; David-Bosne, E (CERN ; IST/ITN, Lisbon) ; Costa, A R G (CERN ; IST/ITN, Lisbon) ; Lupascu, Doru C (Duisburg-Essen U.)
Solid state physics (SSP) research at ISOLDE has been running since the mid-1970s and accounts for about 10%–15% of the overall physics programme. ISOLDE is the world flagship for the on-line production of exotic radioactive isotopes, with high yields, high elemental selectivity and isotopic purity. [...]
2017 - 25 p. - Published in : J. Phys. G 44 (2017) 104001 Fulltext: PDF;

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