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    High spin cycles: topping the spin record for a single molecule verging on quantum criticality

    Magnani, Nicola, Anson, Christopher, Richter, Johannes, Powell, Annie
    NPJ Quantum Materials, 2018, Vol.3(1) [Peer Reviewed Journal]
    © ProQuest LLC All rights reserved, Materials Science Database, Advanced Technologies & Aerospace Database, Publicly Available Content Database, ProQuest Advanced Technologies & Aerospace Collection, ProQuest Materials Science Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Materials Science Collection (ProQuest)
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    Title: High spin cycles: topping the spin record for a single molecule verging on quantum criticality
    Author: Magnani, Nicola; Anson, Christopher; Richter, Johannes; Powell, Annie
    Subject: Gadolinium ; Frustration ; Coordination Compounds ; Entropy ; Iron ; Contrast Agents ; Chemical Synthesis ; Energy Costs ; Critical Point ; Single Electrons ; Chains ; Magnetic Resonance Imaging ; Clusters ; Ground State ; Coupling (Molecular) ; Parameters ; Toruses ; Magnets ; Low Temperature
    Description: The cyclisation of a short chain into a ring provides fascinating scenarios in terms of transforming a finite array of spins into a quasi-infinite structure. If frustration is present, theory predicts interesting quantum critical points, where the ground state and thus low-temperature properties of a material change drastically upon even a small variation of appropriate external parameters. This can be visualised as achieving a very high and pointed summit where the way down has an infinity of possibilities, which by any parameter change will be rapidly chosen, in order to reach the final ground state. Here we report a mixed 3d/4f cyclic coordination cluster that turns out to be very near or even at such a quantum critical point. It has a ground state spin of S = 60, the largest ever observed for a molecule (120 times that of a single electron). [Fe10Gd10(Me-tea)10(Me-teaH)10(NO3)10]·20MeCN forms a nano-torus with alternating gadolinium and iron ions with a nearest neighbour Fe–Gd coupling...
    Is part of: NPJ Quantum Materials, 2018, Vol.3(1)
    Identifier: 23974648 (E-ISSN); 10.1038/s41535-018-0082-7 (DOI)

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    High spin cycles: topping the spin record for a single molecule verging on quantum criticality

    Amer Baniodeh, Nicola Magnani, Yanhua Lan, Gernot Buth, Christopher E. Anson, Johannes Richter, Marco Affronte, Jürgen Schnack, Annie K. Powell
    npj quantum materials, 01 February 2018, Vol.3(1), pp.1-6 [Peer Reviewed Journal]
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    Title: High spin cycles: topping the spin record for a single molecule verging on quantum criticality
    Author: Amer Baniodeh; Nicola Magnani; Yanhua Lan; Gernot Buth; Christopher E. Anson; Johannes Richter; Marco Affronte; Jürgen Schnack; Annie K. Powell
    Subject: Engineering
    Description: Molecular magnets: Large spin state near quantum criticality A single molecule is synthesised with a very large spin state. Molecules that have large spin states have several potential applications such as providing contrast agents for magnetic resonance imaging, however, high-spin molecules are fairly rare because spins have a tendency of pairing up into non-magnetic singlets. An international team of researchers led by Jürgen Schnack from Bielefeld University and Annie Powell from Karlsruhe Institute of Technology now demonstrates a type of molecular magnet that has a ground state spin of S=60, which is 120 times that of a single electron. The mixed 3d/4f cyclic coordination cluster forms a complex nano-torus, whose arrangement gives rise to unusual forms of magnetic frustration, pushing this system towards a quantum critical point that has tens of thousands of energetically degenerate states.
    Is part of: npj quantum materials, 01 February 2018, Vol.3(1), pp.1-6
    Identifier: 2397-4648 (E-ISSN); 10.1038/s41535-018-0082-7 (DOI)