Nuclear spin dynamics in the quantum regime of a single-molecule magnet

Abstract

We show that the nuclear spin dynamics in the single-molecule magnet Mn12-ac below 1 K is governed by quantum tunneling fluctuations of the cluster spins, combined with intercluster nuclear spin diffusion. We also obtain the first experimental proof that - surprisingly - even deep in the quantum regime the nuclear spins remain in good thermal contact with the lattice phonons. We propose a simple model for how T-independent tunneling fluctuations can relax the nuclear polarization to the lattice, that may serve as a framework for more sophisticated theories.

RevTex, 4 pages, 3 eps figures. Final version appeared in PRL

References in corpus (10)

• Low-Temperature Quantum Relaxation in a System of Magnetic Nanomolecules
• The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8
• Quantum Relaxation of Magnetisation in Magnetic Particles
• Crossover between Thermally Assisted and Pure Quantum Tunneling in Molecular Magnet Mn12-Acetate
• Phonon-assisted tunneling in the quantum regime of Mn12-ac
• Magnetic long-range order induced by quantum relaxation in single-molecule magnets
• Coherence Window in the dynamics of Quantum Nanomagnets
• 55Mn NMR in Mn12 acetate: Hyperfine interaction and magnetic relaxation of cluster
• Quantum tunnelling of magnetization in Mn12-ac studied by 55Mn NMR
• Studies of transverse and longitudinal relaxations of ${}^{55}$Mn in molecular cluster magnet Mn${}_{12}$Ac

Cited by in corpus (22)

• Magnetothermal properties of molecule-based materials
• Spin-Based Quantum Computers made by Chemistry: Hows and Whys
• Decoherence in Crystals of Quantum Molecular Magnets
• Local Magnetic Properties of a Monolayer of Mn12 Single Molecule Magnets
• Effects of Intrinsic Spin-Relaxation in Molecular Magnets on Current-Induced Magnetic Switching
• Magnetic dipolar ordering and relaxation in the high-spin molecular cluster compound Mn6
• Many-body Landau-Zener effect at fast sweep
• Giant isotope effect in the incoherent tunneling specific heat of the molecular nanomagnet Fe8
• On the anisotropy barrier reduction in fast relaxing Mn12 single-molecule magnets
• Experimental Estimates of Dephasing Time in Molecular Magnets
• Dynamics and thermalization of the nuclear spin bath in the single-molecule magnet Mn12-ac: test for the theory of spin tunneling
• Effect of finite Coulomb interaction on full counting statistics of electronic transport through single-molecule magnet
• Dynamics of molecular nanomagnets in time-dependent external magnetic fields: Beyond the Landau-Zener-Stückelberg model
• Tunneling and inversion symmetry in single-molecule magnets: the case of the Mn12 wheel molecule
• An automated and versatile ultra-low temperature SQUID magnetometer
• Time relaxation of interacting single--molecule magnets
• Designing adiabatic time-evolution from high frequency bichromatic sources
• Square root relaxation: two possible mechanisms
• Interlayer Diffusion of Nuclear Spin Polarization in $\nu =2/3$ Quantum Hall States
• Spin Bath Decoherence Mediated by Phonons
• Observation of zero-point quantum fluctuations of a single-molecule magnet through the relaxation of its nuclear spin bath
• Quantum nanomagnets and nuclear spins: an overview