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• W2766358205 abstract "Muon spin rotation measurements were used to investigate the spin dynamics of heterometallic ${mathrm{Cr}}_{7}mathrm{Ni}$ and ${mathrm{Cr}}_{7}mathrm{Ni}$-Cu-${mathrm{Cr}}_{7}mathrm{Ni}$ molecular clusters. In ${mathrm{Cr}}_{7}mathrm{Ni}$ the magnetic ions are arranged in a quasiplanar ring and interact via an antiferromagnetic exchange coupling constant $J$, while ${mathrm{Cr}}_{7}mathrm{Ni}$-Cu-${mathrm{Cr}}_{7}mathrm{Ni}$ is composed of two ${mathrm{Cr}}_{7}mathrm{Ni}$ linked by a bridging moiety containing one Cu ion, that induces an inter-ring ferromagnetic interaction ${J}^{ensuremath{'}}ensuremath{ll}J$. The longitudinal muon relaxation rate $ensuremath{lambda}$ collected at low magnetic fields ${ensuremath{mu}}_{0}Hl0.15$ Tesla, shows that the two systems present differences in spin dynamics vs temperature. While both samples exhibit a main peak in the muon relaxation rate vs temperature, at $Tensuremath{sim}10$ K for ${mathrm{Cr}}_{7}mathrm{Ni}$ and $Tensuremath{sim}8$ K for ${mathrm{Cr}}_{7}mathrm{Ni}$-Cu-${mathrm{Cr}}_{7}mathrm{Ni}$, the two compounds have distinct additional features: ${mathrm{Cr}}_{7}mathrm{Ni}$ shows a shoulder in $ensuremath{lambda}(T)$ for $Tl8$ K, while ${mathrm{Cr}}_{7}mathrm{Ni}$-Cu-${mathrm{Cr}}_{7}mathrm{Ni}$ shows a flattening of $ensuremath{lambda}(T)$ for $Tl2$ K down to temperatures as low as $T=20$ mK. The main peak of both systems is explained by a Bloembergen-Purcell-Pound (BPP)-like heuristic fitting model that takes into account of a distribution of electronic spin characteristic times for $Tg5$ K, while the shoulder presented by ${mathrm{Cr}}_{7}mathrm{Ni}$ can be reproduced by a BPP function that incorporates a single electronic characteristic time theoretically predicted to dominate for $Tl5$ K. The flattening of $ensuremath{lambda}(T)$ in ${mathrm{Cr}}_{7}mathrm{Ni}$-Cu-${mathrm{Cr}}_{7}mathrm{Ni}$ occurring at very low temperature can be tentatively attributed to field-dependent quantum effects and/or to an inelastic term in the spectral density of the electronic spin fluctuations." @default.
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• W2766358205 date "2017-11-03" @default.
• W2766358205 modified "2023-09-24" @default.
• W2766358205 title "Low-field spin dynamics of Cr7Ni and Cr7Ni−Cu−Cr7Ni molecular rings as detected by μSR" @default.
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• W2766358205 doi "https://doi.org/10.1103/physrevb.96.184403" @default.
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