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Modification of low temperature magnetic interactions in Dy1- Eu MnO3
K Yadagiri1, R Nithya1, Shilpam Sharma1
1Materials Science Group, Indira Gandhi Centre for Atomic Research, HBNI Kalpakkam - 603102 India nithya@igcar.gov.in.
RSC Advances
|May 11, 2022
Summary
Rare earth ion (Eu3+) substituted DyMnO3 compounds exhibit semiconducting properties and tunable magnetic transitions. Increasing europium concentration softens Raman modes and reduces activation energy for electrical conduction.
Area of Science:
- Materials Science
- Solid-state Chemistry
- Magnetism
Background:
- Dysprosium manganite (DyMnO3) is a multiferroic material with complex magnetic and electrical properties.
- Rare earth ion substitution is a common strategy to tune material properties.
Purpose of the Study:
- To synthesize and characterize solid solutions of Dy1-xEuxMnO3.
- To investigate the effect of Eu3+ substitution on the structural, vibrational, electrical, and magnetic properties.
Main Methods:
- Ceramic method for synthesis.
- Powder X-ray diffraction for structural analysis.
- Raman spectroscopy for vibrational modes.
- Transport studies for electrical properties.
- Molar susceptibility and magnetization measurements for magnetic properties.
Main Results:
- Single-phase orthorhombic Dy1-xEuxMnO3 compounds were synthesized.
- Raman band frequencies decreased with increasing Eu concentration, indicating structural softening.
- All compounds exhibited semiconducting behavior with activated conduction.
- Antiferromagnetic transitions were observed, with Curie-Weiss temperatures suggesting antiferromagnetic interactions.
- Paramagnetic to antiferromagnetic to ferromagnetic transitions were identified with decreasing temperature.
Conclusions:
- Eu3+ substitution in DyMnO3 influences structural, vibrational, electrical, and magnetic properties.
- The study reveals complex magnetic phase transitions, including antiferromagnetic and ferromagnetic interactions.
- The findings contribute to understanding structure-property relationships in rare earth manganites.
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