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A Griffiths-like phase in antiferromagnetic R0.5Eu0.5MnO3 (R = Pr, Nd, Sm)
A Karmakar1, S Majumdar, S Kundu
1Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
Researchers observed a Griffiths-like phase in rare-earth manganites, R(0.5)Eu(0.5)MnO(3), due to structural distortions. This phase is characterized by short-range ferromagnetic spin clusters appearing above the antiferromagnetic transition temperature.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Rare-earth manganites exhibit complex magnetic and electronic properties.
- Jahn-Teller distortions and structural disorder can significantly influence magnetic ordering.
Purpose of the Study:
- To investigate the presence and origin of a Griffiths-like phase in isovalent doped rare-earth manganites R(0.5)Eu(0.5)MnO(3) (R = Pr, Nd, Sm).
- To understand the relationship between structural distortions and magnetic behavior.
Main Methods:
- Rietveld refinement of structural data to analyze crystal structure and distortions.
- DC and AC magnetic susceptibility measurements to probe magnetic properties.
- Analysis of spin cluster formation and magnetic transitions.
Main Results:
- Strong orthorhombic and Jahn-Teller distortions were identified through Rietveld refinement.
- DC and AC magnetic studies provided evidence for Griffiths phase-like behavior.
- Short-range ferromagnetically correlated spin clusters were observed above the antiferromagnetic transition temperature.
Conclusions:
- The observed Griffiths-like phase is attributed to disorder-driven phase inhomogeneity.
- Strong structural distortions are identified as the likely cause of this inhomogeneity and magnetic behavior.
- Isovalent doping in rare-earth manganites can lead to complex magnetic phenomena.
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