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    Molecular Cluster Magnets

    ISBN-10: 9814322946
    ISBN-13: 9789814322942
    Author(s): Richard Winpenny
    Description: This work covers new developments in the field of molecular nanomagnetism, complementing previous books in this area (for example the volume by Gatteschi, Sessoli and Villain on Single Molecule Magnets). The book is written by experts in the field  More...
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    Publisher: World Scientific Publishing Company, Incorporated
    Binding: Hardcover
    Pages: 312
    Size: 6.00" wide x 9.00" long x 0.75" tall
    Weight: 1.298
    Language: English

    This work covers new developments in the field of molecular nanomagnetism, complementing previous books in this area (for example the volume by Gatteschi, Sessoli and Villain on Single Molecule Magnets). The book is written by experts in the field and is intended as a compilation of critical reviews of new areas rather than a comprehensive text. Book jacket.

    Preface
    Supramolecular Polymetallic 2D [n � n] Transition Metal Grids - Approaches to Ordered Molecular Assemblies and Functional Molecular Devices
    Convergent Self-assembly
    Introduction and overview
    Polytopic ligands for [n � n] square grids-design and self-assembly
    Thermodynamic aspects of the formation of convergent self-assembled grid architectures
    Ligands and Complexes
    Ditopic ligands and their complexes
    Homometallic complexes
    [2�2] grids with heterocyclic diazine (N<sub>2</sub>) bridging ligands
    Ditopic ligands with more remote coordination pockets
    Other polynuclear oligomers with remote ditopic ligands
    [2 � 2] grids with single atom �-O and �-S bridging ditopic ligands
    Ditopic hydrazone ligands with both �-O or �-NN bridging modes
    Higher order oligomeric clusters based on ditopic ligands
    Heterometallic [2 � 2] and mixed spin state grids
    Symmetric tritopic ligands and their complexes
    Homometallic [3 � 3] grids
    Heterometallic and mixed spin state [3�3] grids
    Tetratopic ligands and complexes
    Homometallic [4 � 4] grids
    Pentatopic ligands and their complexes
    Homometallic [5 � 5] grids
    Other Oligomers in the Assembly Process
    Incomplete grids, clusters and chains
    Nano-scale Molecular-Based Devices?
    Conclusions and Future Perspectives
    References
    Recent Synthetic Results Involving Single Molecule Magnets
    Introduction
    A Brief Introduction to the Physics of SMMs
    Further SMMs Based on Mn(III)
    The largest SMM; a [Mn<sub>84</sub>] torus
    Record spin number, S<sub>T</sub> = 83/2, but no slow relaxation
    Record magnetic anisotropy barrier; a Mn<sub>6</sub> cluster
    Quantum entanglement between SMMs; first discovered in a pair of Mn<sub>4</sub> clusters
    [Mn<sub>3</sub><sup>III</sub> Mn<sup>IV</sup>] clusters with an S = 9/2 ground state
    The [Mn<sub>2</sub><sup>III</sub> Mn<sub>2</sub><sup>II</sup>] family of "rhombic" SMMs
    Oxime bridged SMMs with the core [Mn<sub>3</sub><sup>III</sub>O] and S<sub>T</sub> = 6
    Magnetostructural correlations within a family of [Mn<sub>6</sub><sup>III</sub>] SMMs
    MMs Based on Fe(III) Ions
    New SMMs Based on Divalent 3d-Ions
    Slow Relaxation in Complexes Involving 4f-Elements
    Single atom magnets
    Polymetallic 4f-complexes
    Heterometallic 3d-4f SMMs
    Metallocyanate Based SMMs
    Conclusions
    References
    The Nanoscopic V<sub>15</sub> Cluster: A Unique Magnetic Polyoxometalate
    The Unique Magnetic Polyoxometalate V<sub>15</sub>
    Structure and Superexchange Pathways
    Exchange Interactions within the Triangle Model
    Isotropic exchange within the triangle model
    �Accidental' degeneracy and spin-frustration
    Pseudo-angular momentum representation
    Antisymmetric exchange, zero-field splitting
    Ab initio calculations
    Zeeman Levels, Magnetic Anisotropy
    Electron Paramagnetic Resonance
    EPR spectrum of V<sub>15</sub>: Role of antisymmetric exchange and selection rules
    Discussion of the experimental EPR data
    Static Magnetization
    The theoretical model
    Discussion of the experimental magnetization data
    Dynamic Properties, Relaxation, Spin Dynamics
    Relaxation mechanisms and magnetic hysteresis
    Spin dynamics in the muon scattering experiment
    Rabi oscillations and implementation of molecular magnets in quantum computing
    Spin-vibronic Interaction
    Hamiltonian of spin-vibronic coupling
    Adiabatic surfaces
    Influence of the Jahn-Teller effect on the magnetization
    Estimation of the vibronic parameters for V<sub>15</sub>
    Role of Structural Deformations
    Zero-field splitting in a scalene triangular system
    Discussion of inelastic neutron scattering experiments
    Energy pattern of a scalene triangular system
    Magnetic properties of the scalene systems
    Field induced Jahn-Teller instability
    NMR Experiments
    Conclusions and Outlook
    References
    Neutron Spectroscopy of Molecular Nanomagnets
    Introduction
    Neutron Scattering: Basics Principles
    Neutron scattering cross section
    Nuclear scattering
    Magnetic scattering
    The time-of-flight technique
    Exchange Interaction: A Spectroscopic Measurement
    Spin dynamics in antiferromagnetic molecular rings
    Elementary excitations in antiferromagnetic rings
    Probing Quantum Coherence
    Tunneling of the N�el vector
    Quantum oscillations of the total spin
    Zero-Field Splitting Anisotropy in High Spin Clusters
    The giant spin approximation and beyond
    Beyond the giant spin approximation
    References
    Recent Developments in EPR Spectroscopy of Molecular Nanomagnets
    Beyond the Giant Spin Approximation (GSA)
    Discrete Clusters-of-Clusters
    Pulsed EPR
    References
    Simulating Computationally Complex Magnetic Molecules
    Introduction
    Scope and purpose
    Introduction to the Heisenberg Hamiltonian
    Usefulness and limitations of matrices
    Quantum Monte Carlo Simulations
    Avoiding the 'roadblock' of large matrices
    Energy spectrum for symmetric rings
    Applications to heterometallic rings
    Applications to frustrated magnetic molecules
    Classical Spin Dynamics Simulations
    The classical heisenberg hamiltonian
    Classical Monte Carlo simulations
    The spin equations of motion
    Heat bath simulational methods
    Revealing novel physics in magnetic molecules with classical methods
    Competing spin phases and exchange disorder in the Keplerate type molecules {Mo<sub>72</sub>Fe<sub>30</sub>} and {Mo<sub>72</sub>Cr<sub>3o</sub>}
    Metamagnetic phase transitions in magnetic polytopes
    Critical slowing-down in Heisenberg magnetic molecules
    Summary
    References
    Index

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