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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tarazaga Martín-Luengo, Aitana
Universidad de Oviedo
in Cooperation with on an Cooperation-Score of 37%
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article
Unusual charge states and lattice sites of Fe in Al<sub> x </sub>Ga<sub>1−x </sub>N:Mn
Abstract
<jats:title>Abstract</jats:title><jats:p>Charge states and lattice sites of Fe ions in virgin and Mn-doped Al<jats:sub><jats:italic>x</jats:italic></jats:sub>Ga<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>N samples were investigated using <jats:sup>57</jats:sup>Fe emission Mössbauer spectroscopy following radioactive <jats:sup>57</jats:sup>Mn<jats:sup>+</jats:sup> ion implantation at ISOLDE, CERN. In the undoped Al<jats:sub><jats:italic>x</jats:italic></jats:sub>Ga<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>N, Fe<jats:sup>2+</jats:sup> on Al/Ga sites associated with nitrogen vacancies and Fe<jats:sup>3+</jats:sup> on substitutional Al/Ga sites are identified. With Mn doping, the contribution of Fe<jats:sup>3+</jats:sup> is considerably reduced and replaced instead by a corresponding emergence of a single-line-like component consistent with Fe<jats:sup>4+</jats:sup> on Al/Ga sites. Density functional theory calculations confirm the Fe<jats:sup>4+</jats:sup> charge state as stabilised by the presence of substitutional Mn<jats:sup>2+</jats:sup> in its vicinity. The completely filled spin up orbitals in Mn<jats:sup>2+</jats:sup> (3d<jats:sup>5</jats:sup>) are expected to enhance magnetic exchange interactions. The population of the Fe<jats:sup>4+</jats:sup> state is less pronounced at high Al concentration in Al<jats:sub><jats:italic>x</jats:italic></jats:sub>Ga<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>N:Mn, a behaviour attributable to hybridisation effects of 3d states to the semiconductor bands which weakens with increasing (decreasing) Al (Ga) content. Our results demonstrate that co-doping promotes the co-existence of unusual charge states of Fe<jats:sup>4+</jats:sup> and Mn<jats:sup>2+</jats:sup>, whereas their trivalent charge states prevail with either transition metal incorporated independently in III-nitrides. Co-doping thus opens up a new avenue for tailoring novel magnetic properties in doped semiconductors.</jats:p>