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Sökning: WFRF:(Bulled J. M.)

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1.
  • Coates, C. S., et al. (författare)
  • Ferroic multipolar order and disorder in cyanoelpasolite molecular perovskites
  • 2019
  • Ingår i: Philosophical Transactions. Series A. - : ROYAL SOC. - 1364-503X .- 1471-2962. ; 377:2149
  • Tidskriftsartikel (refereegranskat)abstract
    • We use a combination of variable-temperature highresolution synchrotron X-ray powder diffraction measurements and Monte Carlo simulations to characterize the evolution of two different types of ferroic multipolar order in a series of cyanoelpasolite molecular perovskites. We show that ferroquadrupolar order in [C3N2H5](2)Rb[Co(CN)(6)] is a first-order process that is well described by a fourstate Potts model on the simple cubic lattice. Likewise, ferrooctupolar order in [NMe4](2)B[Co(CN)(6)] (B= K, Rb, Cs) also emerges via a first-order transition that now corresponds to a six-state Potts model. Hence, for these particular cases, the dominant symmetry breaking mechanisms are well understood in terms of simple statistical mechanical models. By varying composition, we find that the effective coupling between multipolar degrees of freedom- and hence the temperature at which ferromultipolar order emerges-can be tuned in a chemically sensible manner. This article is part of the theme issue 'Mineralomimesis: natural and synthetic frameworks in science and technology'.
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2.
  • Bulled, Johnathan M., et al. (författare)
  • Percolation-Induced Ferrimagnetism from Vacancy Order in [Gua]Mn1-x Fe2x/3(HCOO)3 Hybrid Perovskites
  • 2024
  • Ingår i: Journal of the American Chemical Society. - 0002-7863 .- 1520-5126. ; 146:20, s. 13714-13718
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the magnetic behavior of the hybrid perovskites [Gua]Mn1–xFe2x/3□x/3(HCOO)3 (0 ≤ x ≤ 0.88), showing that vacancy ordering drives bulk ferrimagnetism for x > 0.6. The behavior is rationalized in terms of a simple microscopic model of percolation-induced ferrimagnetism. Monte Carlo simulations driven by this model reproduce the experimental dependence of magnetic susceptibility on x and show that, at intermediate compositions, domains of short-range vacancy order lead to the emergence of local magnetization. Our results open up a new avenue for the design of multiferroic hybrid perovskites.
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