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Disordered ferromagnetism in Ho2NiMnO6 double perovskite
Tirthankar Chakraborty1, Harikrishnan S Nair2,3, Hariharan Nhalil1
1Department of Physics, Indian Institute of Science, Bangalore 560012, India.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 15, 2016
Summary
This study investigates the magnetic and dielectric properties of the double perovskite Ho2NiMnO6. Researchers observed a ferromagnetic transition and potential metamagnetic transitions, suggesting complex magnetic interactions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Double perovskites are complex oxides with tunable magnetic and dielectric properties.
- Understanding the interplay between magnetic and lattice structures is crucial for novel material design.
Purpose of the Study:
- To synthesize and characterize the magnetic and dielectric properties of the double perovskite Ho2NiMnO6.
- To investigate phase transitions and magnetic interactions within the material.
Main Methods:
- Synthesis via nitrate route.
- Crystal structure refinement using powder X-ray diffraction.
- Temperature-dependent magnetization (M(T)) measurements.
- Magnetic susceptibility analysis (Curie-Weiss law).
- Magnetic hysteresis loops at low temperatures.
- Dielectric property measurements.
Main Results:
- Ho2NiMnO6 crystallizes in the monoclinic P21/n space group.
- A ferromagnetic phase transition was observed at a specific temperature.
- Evidence of a Griffiths phase related to the Ni/Mn subsystem was found.
- Metamagnetic transitions were indicated by magnetization derivative analysis.
- Two distinct dielectric relaxations were observed, with one coinciding with the magnetic transition.
Conclusions:
- Ho2NiMnO6 exhibits complex magnetic behavior, including a ferromagnetic transition and potential metamagnetic transitions.
- The magnetic properties are influenced by both Ho3+ and the Ni/Mn subsystem.
- A plausible correlation exists between magnetic and lattice degrees of freedom, evidenced by dielectric anomalies.
- Further investigation is needed to fully elucidate the observed metamagnetic transitions.
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