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• W2000748855 abstract "The magnetic properties and the spin dynamics of two molecular magnets have been investigated by magnetization and dc susceptibility measurements, electron paramagnetic resonance and proton nuclear magnetic resonance (NMR) over a wide range of temperatures (1.6--300K) at applied magnetic fields $H=0.5$ and 1.5 T. The two molecular magnets consist of $phantom{[}{phantom{{}{text{Cu}}^{text{II}}(text{saldmen})({text{H}}_{2}text{O})}}_{6}{{text{Fe}}^{text{III}}{(text{CN})}_{6}}]{({text{ClO}}_{4})}_{3}ensuremath{cdot}8{text{H}}_{2}text{O}$ in short ${text{Cu}}_{6}text{Fe}$ (here H saldmen is the Schiff base resulted by reacting salicylaldehyde with N,N-dimethylethylenediamine) and the analog compound with cobalt, ${text{Cu}}_{6}text{Co}$. It is found that in ${text{Cu}}_{6}text{Fe}$, whose magnetic core is constituted by six ${text{Cu}}^{2+}$ ions and one ${text{Fe}}^{3+}$ ion all with $s=1/2$, a weak ferromagnetic interaction between ${text{Cu}}^{2+}$ moments through the central ${text{Fe}}^{3+}$ ion with $J=0.14text{ }text{K}$ is present, while in ${text{Cu}}_{6}text{Co}$ the ${text{Co}}^{3+}$ ion is diamagnetic and the weak interaction is antiferromagnetic with $J=ensuremath{-}1.12text{ }text{K}$. The NMR spectra show the presence of nonequivalent groups of protons with a measurable contact hyperfine interaction consistent with a small admixture of $s$ wave function with the $d$ function of the magnetic ion. The NMR relaxation results are explained in terms of a single-ion $({text{Cu}}^{2+},text{ }{text{Fe}}^{3+},text{ }{text{Co}}^{3+})$ uncorrelated spin dynamics with an almost temperature-independent correlation time due to the weak magnetic exchange interaction. We conclude that the two molecular magnets studied here behave as single-molecule paramagnets with a very weak intramolecular interaction, almost on the order of the dipolar intermolecular interaction. Thus they represent a separate class of molecular magnets which differ from the single-molecule magnets investigated up to now, where the intramolecular interaction is much larger than the intermolecular one." @default.
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• W2000748855 date "2009-09-21" @default.
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• W2000748855 title "Magnetic properties and spin dynamics in the single-molecule paramagnets<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mn>6</mml:mn></mml:msub><mml:mtext>Fe</mml:mtext></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mn>6</mml:mn></mml:msub><mml:mtext>Co</mml:mtext></mml:mrow></…" @default.
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• W2000748855 doi "https://doi.org/10.1103/physrevb.80.094413" @default.
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