Potential magnetic structure in Eu3InAs3revealed by magnetization and thermodynamic study
Ming Liu1,2, Shuai Zhang2,3, Ke Jia2
1School of Physics, Henan Normal University, Xinxiang 453007, People's Republic of China.
Summary
This study explores antiferromagnetic transitions in Eu3InAs3, revealing distinct axis expansions/contractions and a 1/3 magnetization plateau linked to spin-flip transitions. Combined magnetization and thermodynamic analysis clarifies complex magnetic structures in spin-lattice coupled materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Antiferromagnetic (AFM) transitions in magnetic semiconductors are crucial for understanding complex magnetic behaviors.
- Eu3InAs3 exhibits intriguing magnetic properties that warrant detailed investigation.
- Spin-lattice coupling significantly influences magnetic structures and thermodynamic responses.
Purpose of the Study:
- To systematically investigate the magnetization and thermodynamic responses during AFM transitions in Eu3InAs3.
- To elucidate the magnetic structure changes associated with spin-flop and spin-flip transitions under an applied field.
- To establish a correlation between magnetic structure and spin-lattice coupling.
Main Methods:
- Linear thermal expansion measurements to observe dimensional changes during magnetic transitions.
- A simplified mean-field model incorporating AFM exchange interactions, anisotropy, and Zeeman coupling.
- Analysis of magnetization data and adiabatic magnetocaloric effect to determine magnetic entropy.
Main Results:
- The 'a' axis expands, while 'b' and 'c' axes contract at the two AFM transitions (TN1 and TN2).
- A 1/3 magnetization plateau along the 'b' axis is attributed to a partial spin-flip transition in a multiple-easy-axis magnetic structure.
- The number of ordered Eu2+ moments at TN1 is approximately twice that at TN2, confirmed by magnetic entropy analysis.
Conclusions:
- The magnetic structure of Eu3InAs3 involves distinct ordering of Eu sublattices along different axes at TN1 and TN2.
- Combined magnetization and thermodynamic studies provide a straightforward approach to understanding magnetic structures in materials with strong spin-lattice coupling.
- The findings offer insights into the interplay between magnetism and lattice dynamics in advanced magnetic materials.
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