Respuesta ferrimagnética-antiferromagnética sintonizable mediante la inclusión de Fe en la manganita basada en gadolinio GdMnO3
| Autor: | Jorge Cardona-Vasquez, David Landínez-Téllez, Jairo Roa-Rojas |
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| Jazyk: | English<br />Spanish; Castilian |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Revista UIS Ingenierías, Vol 19, Iss 3 (2020) |
| Druh dokumentu: | article |
| ISSN: | 1657-4583 2145-8456 |
| Popis: | In this work a study of the synthesis process, crystal structure and magnetic behavior of gadolinium manganite with Fe substitutions in Mn positions of GdMn1-xFexO3 (x=0, 0.1, 0.2) is reported. The samples were synthetized by the conventional solid-state reaction method. Structural characterization of final compounds was analyzed by Rietveld refinement, which revealed its crystallization in an orthorhombic symmetry belonging to the Pbnm (No. 62) space group. Results reveal that a and c cell parameters and the unit cell volume increase, while the lattice parameter b and the cell volume decrease with Fe substitution. The main effect in the structure is related to oxygen positions, i.e. in the octahedral distortions and rotations. DC susceptibility measurements, in the temperature regime between 4 K and 300 K on the application of an external field of 200 Oe, show a paramagnetic feature at high temperatures for all x studied values, with magnetic transitions associated to a magnetic ordered state at low temperatures (21.8 K < T < 25.2 K). Meanwhile, a ferrimagnetic transition is detected for x=0.1 close to T=30.7 K. In order to explain the appearance of ferrimagnetism for this configuration, a model is suggested where an imbalance in the magnetic structure of GdMnO3 (type-A antiferromagnetic) generated due to the introducing a Fe3+ ion in each pair consecutive unit cells is proposed. The effective magnetic moment obtained agrees to the reported value for the material with x=0.0, confirming the ferrimagnetic behavior for this concentration of Fe3+ in the structure. |
| Databáze: | Directory of Open Access Journals |
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