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- W2896020621 abstract "We present the results of broadband dielectric spectroscopy of $mathrm{GaM}{mathrm{o}}_{4}{mathrm{S}}_{8}$, a lacunar spinel system that recently was shown to exhibit non canonical, orbitally driven ferroelectricity. Our study reveals complex relaxation dynamics of this multiferroic material, both above and below its Jahn-Teller transition at ${T}_{mathrm{JT}}=47phantom{rule{0.16em}{0ex}}mathrm{K}$. Above ${T}_{mathrm{JT}}$, two types of coupled dipolar-orbital dynamics seem to compete: relaxations within cluster-like regions with short-range polar order as in relaxor ferroelectrics and critical fluctuations of only weakly interacting dipoles, the latter resembling the typical dynamics of order-disorder type ferroelectrics. Below the Jahn-Teller transition, the onset of orbital order drives the system into long-range ferroelectric order and dipolar dynamics within the ferroelectric domains is observed. The coupled dipolar and orbital relaxation behavior of $mathrm{GaM}{mathrm{o}}_{4}{mathrm{S}}_{8}$ above the Jahn-Teller transition markedly differs from that of the skyrmion host $mathrm{Ga}{mathrm{V}}_{4}{mathrm{S}}_{8}$, which seems to be linked to differences in the structural distortions of the two systems on the unit-cell level." @default.
- W2896020621 created "2018-10-26" @default.
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- W2896020621 date "2018-12-20" @default.
- W2896020621 modified "2023-10-10" @default.
- W2896020621 title "Orbital-order driven ferroelectricity and dipolar relaxation dynamics in multiferroic <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>GaM</mml:mi><mml:msub><mml:mi mathvariant=normal>o</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>S</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2896020621 doi "https://doi.org/10.1103/physrevb.98.224306" @default.
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