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- W2059438369 abstract "The solid solutions of ${text{CaBaFe}}_{4ensuremath{-}x}{text{Li}}_{x}{text{O}}_{7}$ $({text{CBFLi}}_{x})$ with the ``114'' hexagonal symmetry $(P{6}_{3}mc)$ could be synthesized for $0ensuremath{le}xensuremath{le}0.4$. The dc magnetization study of these oxides shows that they are ferrimagnetic (FiM). The FiM to paramagnetic transition temperature, ${T}_{C}$, decreases from 265.6 K for $x=0$ to 97.5 K for $x=0.4$ in agreement with the introduction of the diamagnetic ${text{Li}}^{1+}$ cation at the Fe sublattice. No magnetic saturation is observed and the coercive field ${H}_{C}$ is very large, ranging from 0.7 to 0.9 T at 5 K. Importantly, the ac magnetic susceptibility, ${ensuremath{chi}}_{text{ac}}(T)$, indicates a frequency-dependent freezing temperature, ${T}_{f}$, increasing with frequency and satisfying the conventional power law, $ensuremath{tau}/{ensuremath{tau}}_{0}={({T}_{f}/{T}_{text{SG}}ensuremath{-}1)}^{ensuremath{-}zensuremath{upsilon}}$. For the undoped ${text{CaBaFe}}_{4}{text{O}}_{7}$ (CBFO) $(x=0)$, the best fitting parameters are characteristic of a spin glass with a transition temperature ${T}_{text{SG}}=176text{ }text{K}$, spin-relaxation time ${ensuremath{tau}}_{0}=4.9ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}12}text{ }text{s}$, and critical exponent $(zensuremath{upsilon})$ of 6.4. In contrast, for ${text{CBFLi}}_{x}$ $(0.1ensuremath{le}xensuremath{le}0.4)$ series the ${ensuremath{tau}}_{0}$ increases from $1.3ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}14}$ to $8ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}16}text{ }text{s}$ as $x$ is increased; the values of $zensuremath{upsilon}$ are in the range of 12--13, which lies much closer to that of cluster glasses (${ensuremath{tau}}_{0}={10}^{ensuremath{-}14}--{10}^{ensuremath{-}16}text{ }text{sec}$; $zensuremath{upsilon}=12--14$). The resistivity behavior is consistent with small polaronic hopping which changes to variable range hopping at low temperatures. The measurements under $Hensuremath{sim}7text{ }text{T}$ show that only CBFO (undoped) exhibits magnetoresistance, with a maximum value of 4.3% at 264 K." @default.
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- W2059438369 date "2009-06-05" @default.
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- W2059438369 title "Spin glass to cluster glass transition in geometrically frustrated<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>CaBaFe</mml:mtext></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>ferrimagnets" @default.
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- W2059438369 doi "https://doi.org/10.1103/physrevb.79.224407" @default.
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