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| Hauptseite > Publications database > Microscopic Study of the AC Conductivity in MgFe$_{2}$O$_{4}$. Appearance of the Magnetic Polaron |
| Hauptseite > Publications database > Microscopic Study of the AC Conductivity in MgFe$_{2}$O$_{4}$. Appearance of the Magnetic Polaron |
| Journal Article | IMPULSE-2024-00136 |
; ; ; ;
2024
Springer Science + Business Media B.V.
New York, NY
Please use a persistent id in citations: doi:10.1007/s10773-024-05698-5
Abstract: A microscopic study of the large or dielectric polaron behaviour has been carried out for the first time for MgFe2O4. We have considered a new methodology to study in depth the Overlap Large Polaron Tunneling (OLPT) conduction mechanism in a large temperature range. This methodology consists in extracting theory from experimental data. Unexpected and even spectacular results are determined. However, to the best of our knowledge, it is for the first time, that we prove the existence of the magnetic polaron in MgFe2O4 in the ferromagnetic phase as an alternative to the dielectric one. The function added to the trapping potential shows a competitive behavior between the magnetic effect and the crystal lattice acoustic vibration. Our theoretical model can be generalized for ferrite materials exhibiting the (OLPT) conduction mechanism. Indeed, this model allows checking the existence or not of the magnetic polaron, to determine its radius, the magnetic correlation length variation with frequency, the formation temperature of the magnetic polaron (TM) and other features sometimes inaccessible even experimentally.
Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)
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