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.
Abstract:
We systematically investigate the magnetization and thermodynamic responses associated with the antiferromagnetic (AFM) transitions in magnetic semiconductor Eu3InAs3. The linear thermal expansion measurements reveal thataaxis expands whereasbandcaxes contract with the onset of the two AFM transitions atTN1andTN2. Using a simplified mean-field model incorporating AFM exchange interactions, easy-axis anisotropy, and Zeeman coupling, we analyze the potential magnetic structure change associated with the spin-flop and spin-flip transitions in field. The agreement between experimental and calculated magnetization data suggests that the1/3plateau alongbaxis results from a partial spin-flip transition in a multiple-easy-axis magnetic structure, where Eu2-Eu3and Eu1sublattices order antiferromagnetically along thebandaaxes atTN1andTN2, respectively. Consistently, field dependence of magnetic entropy determined using low-Tadiabatic magnetocaloric effect indicates that the number of the ordered Eu2+moments atTN1is nearly twice that atTN2. Our results demonstrate that the magnetic structure in materials with strong spin-lattice coupling can be simply approached by a combined magnetization and thermodynamic study.
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