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- W2736005245 abstract "Hexagonal ferrites not only have enormous commercial impact (textsterling{}2 billion/year in sales) due to applications that include ultrahigh-density memories, credit-card stripes, magnetic bar codes, small motors, and low-loss microwave devices, they also have fascinating magnetic and ferroelectric quantum properties at low temperatures. Here we report the results of tuning the magnetic ordering temperature in $mathrm{PbF}{mathrm{e}}_{12ensuremath{-}x}mathrm{G}{mathrm{a}}_{x}{mathrm{O}}_{19}$ to zero by chemical substitution $x$. The phase transition boundary is found to vary as ${T}_{N}ensuremath{sim}{(1ensuremath{-}x/{x}_{c})}^{2/3}$ with ${x}_{c}$ very close to the calculated spin percolation threshold, which we determine by Monte Carlo simulations, indicating that the zero-temperature phase transition is geometrically driven. We find that this produces a form of compositionally tuned, insulating, ferrimagnetic quantum criticality. Close to the zero-temperature phase transition, we observe the emergence of an electric dipole glass induced by magnetoelectric coupling. The strong frequency behavior of the glass freezing temperature ${T}_{m}$ has a Vogel-Fulcher dependence with ${T}_{m}$ finite, or suppressed below zero in the zero-frequency limit, depending on composition $x$. These quantum-mechanical properties, along with the multiplicity of low-lying modes near the zero-temperature phase transition, are likely to greatly extend applications of hexaferrites into the realm of quantum and cryogenic technologies." @default.
- W2736005245 created "2017-07-21" @default.
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- W2736005245 date "2017-07-17" @default.
- W2736005245 modified "2023-10-17" @default.
- W2736005245 title "Quantum percolation phase transition and magnetoelectric dipole glass in hexagonal ferrites" @default.
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- W2736005245 doi "https://doi.org/10.1103/physrevb.96.020407" @default.
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