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Quantum paraelectricity to dipolar glass transition in Sc dopedBaFe12O19single crystals
Applied Physics Letters ( IF 3.521 ) Pub Date : 2019-12-26 , DOI: 10.1063/1.5135097
L. H. Yin, R. R. Zhang, J. Yang, P. Tong, W. H. Song, J. M. Dai, X. B. Zhu, Y. P. Sun

We report a quantum paraelectric (QP) to dipolar glass (DG) phase transition induced by Sc substitution in ferrimagnetic hexaferrite BaFe 12 − x Sc x O 19 ( 0 ≤ x ≤ 2.4) single crystals. The DG behavior is revealed via anisotropic dielectric spectroscopy, polarization, and specific heat measurements. The phase evolution from QP to DG ( 0.5 ≤ x ≤ 1.2) and finally to the nonpolar state ( x ≥ 2.4) with increasing x is found to be due to the competition between the enhanced polar instability by lattice volume expansion and disordered/frustrated dipole-dipole interaction induced by the partial replacement of Sc 3 + for Fe 3 + in the bipyramids. Our results suggest further experimental clues to realize possible multiferroicity with strong displacive ferroelectricity in BaFe 12 O 19 and other magnetic materials.
更新日期:2019-12-31

 

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