Spin quantum tunneling via entangled states in a dimer of exchange coupled single-molecule magnets

Abstract

A new family of supramolecular, antiferromagnetically exchange-coupled dimers of single-molecule magnets (SMMs) has recently been reported [W. Wernsdorfer, N. Aliaga-Alcalde, D.N. Hendrickson, and G. Christou, Nature 416, 406 (2002)]. Each SMM acts as a bias on its neighbor, shifting the quantum tunneling resonances of the individual SMMs. Hysteresis loop measurements on a single crystal of SMM-dimers have now established quantum tunneling of the magnetization via entangled states of the dimer. This shows that the dimer really does behave as a quantum-mechanically coupled dimer. The transitions are well separated, suggesting long coherence times compared to the time scale of the energy splitting. This result is of great importance if such systems are to be used for quantum computing. It also allows the measurement of the longitudinal and transverse superexchange coupling constants.

arXiv comment5 pages, 5 figures

References in corpus (7)

• Low-Temperature Quantum Relaxation in a System of Magnetic Nanomolecules
• Observation of the distribution of molecular spin states by resonant quantum tunneling of the magnetization
• The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8
• Spin-spin cross-relaxation in single-molecule magnets
• Crossover between Thermally Assisted and Pure Quantum Tunneling in Molecular Magnet Mn12-Acetate
• Quantum tunneling in a three dimensional network of exchange coupled single-molecule magnets
• Magnetization Process of Single Molecule Magnets at Low Temperatures

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• Entangled Electrons Drive a non-Superexchange Mechanism in a Cobalt Quinoid Dimer Complex
• Spin anisotropy effects in dimer single molecule magnets
• Quantum dynamics of exchange biased Single Molecule Magnets
• Effect of dipolar interactions on the magnetization of a cubic array of nanomagnets
• Interference effect in the Landau-Zener tunneling of the antiferromagnetically coupled dimer of single-molecule magnets
• Time relaxation of interacting single--molecule magnets
• Two-qubit Quantum Logic Gate in Molecular Magnets
• Antiferromagnetic molecular nanomagnets with odd-numbered coupled spins
• Phase transition between quantum and classical regimes for the escape rate of dimeric molecular nanomagnets in a staggered magnetic field
• Stochastic heating of a molecular nanomagnet
• Chaotic dynamics and spin correlation functions in a chain of nanomagnets
• EPR spectrum via entangled states for an Exchange-Coupled Dimer of Single-Molecule Magnets
• Rotating Entangled States of an Exchange-Coupled Dimer of Single-Molecule Magnets
• Reply to Wernsdorfer's post: "Correspondence on: Quantum interference of tunnel trajectories between states of different spin lenght in a dimeric molecular nanomagnet"