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Muon spin rotation measurements were used to investigate the spin dynamics of heterometallic Cr 7 Ni and Cr 7 Ni-Cu-Cr 7 Ni molecular clusters. In Cr 7 Ni the magnetic ions are arranged in a quasiplanar ring and interact via an antiferromagnetic exchange coupling constant J, while Cr 7 Ni-Cu-Cr7Ni is composed of two Cr7Ni linked by a bridging moiety containing one Cu ion, that induces an inter-ring ferromagnetic interaction J ≪ J. The longitudinal muon relaxation rate λ collected at low magnetic fields μ0H 5 K, while the shoulder presented by Cr 7 Ni can be reproduced by a BPP function that incorporates a single electronic characteristic time theoretically predicted to dominate for T < 5 K. The flattening of λ(T ) in Cr 7 Ni-Cu-Cr 7 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.

physical review. b./physical review. b

Low-field spin dynamics of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cr</mml:mi><mml:mn>7</mml:mn></mml:msub><mml:mi>Ni</mml:mi></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cr</mml:mi><mml:mn>7</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>Ni</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Cu</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Cr</mml:mi></mml:mrow><mml:mn>7</mml:mn></mml:msub><mml:mi>Ni…

Low-field spin dynamics of Cr7Ni and Cr7Ni−Cu−Cr7Ni…