What relaxes muon spins in molecular nanomagnets?

Abstract

We address the cause of the unusual muon spin relaxation (muSR) results on molecular nanomagnets (MNMs). Through measurements on protonated and deuterated samples of the MNMs Cr7Mn (S=1) and Cr8 (S=0), we show that the muon spin for $S\ne 0$ MNMs is relaxed via dynamic fluctuations of the electronic spins. A freezing out of dynamic processes occurs on cooling and at low temperatures the muon spins are relaxed by the electronic spins which themselves are dephased by incoherent nuclear field fluctuations.We observe a transition to a state of static magnetic order of the MNM electronic spins in Cr7Mn below 2 K.

4 pages, 3 figures

References in corpus (5)

• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Pair-wise decoherence in coupled spin qubit networks
• Spin dynamics of heterometallic Cr7M wheels (M = Mn, Zn, Ni) probed by inelastic neutron scattering
• NMR as a probe of the relaxation of the magnetization in magnetic molecules
• Experimental Estimates of Dephasing Time in Molecular Magnets

Cited by in corpus (5)

• Low-Temperature Transport in Out-of-Equilibrium XXZ Chains
• A Clock Transition in the Cr${}_7$Mn Molecular Nanomagnet
• Persistent dynamics in the S=1/2 quasi-one-dimensional chain compound Rb4Cu(MoO4)3 probed with muon-spin relaxation
• Observation of a level crossing in a molecular nanomagnet using implanted muons
• Enhancing Coherence with a Clock Transition and Dynamical Decoupling in the Cr${}_7$Mn Molecular Nanomagnet