Bibliographic Details
| Title: |
Tunable ferrimagnetic-antiferromagnetic response by the inclusion of Fe in the gadolinium-based manganite GdMnO3. |
| Alternate Title: |
Respuesta ferrimagnética-antiferromagnética sintonizable mediante la inclusión de Fe en la manganita basada en gadolinio GdMnO3. |
| Authors: |
Cardona-Vasquez, Jorge A.1 joacardonava@unal.edu.co, Landínez-Téllez, David A.1 dalandinezt@unal.edu.co, Roa-Rojas, Jairo1 jroar@unal.edu.co |
| Source: |
UIS Ingenierías. jul-sep2020, Vol. 19 Issue 3, p69-77. 9p. |
| Subjects: |
Magnetic structure, Unit cell, Magnetic transitions, Crystal structure, Rietveld refinement |
| Abstract (English): |
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. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): |
En este trabajo es reportado el proceso de síntesis, la estructura cristalina y el comportamiento magnético de gadolinio manganita con sustituciones de Fe en las posiciones Mn del material GdMn1-xFexO3 (x = 0, 0.1, 0.2). Las muestras fueron sintetizadas por medio del método convencional de reacción en estado sólido. La caracterización estructural de los compuestos finales se analizó mediante refinamiento de Rietveld, el cual reveló su cristalización en una simetría ortorrómbica perteneciente al grupo espacial Pbnm (No. 62). Los resultados revelan que los parámetros de red a y c y el volumen de la celda aumentan, mientras que el parámetro de la red b y el volumen de la celda disminuyen con la sustitución de Fe. El efecto principal en la estructura está relacionado con las posiciones de oxígeno, es decir, con las distorsiones y rotaciones octaédricas. Las mediciones de susceptibilidad DC, en el régimen de temperatura entre 4 K y 300 K bajo la aplicación de un campo externo de 200 Oe, muestran una característica paramagnética a altas temperaturas para todos los valores estudiados de concentración x, con transiciones magnéticas asociadas a un estado magnético ordenado a bajas temperaturas (21,8 K
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| Database: |
Engineering Source |
