Breakdown of the Giant Spin Model in the Magnetic Relaxation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Mn</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>Nanomagnets

Carretta, S.; Guidi, T.; Santini, P.; Amoretti, G.; Pieper, O.; Lake, B.; Slageren, Joris van; Hallak, Fadi El; Wernsdorfer, Wolfgang; Mutka, H.; Russina, Margarita; Milios, Constantinos J.; Brechin, Euan K.

doi:10.1103/physrevlett.100.157203

Cited by 74 publications

(94 citation statements)

References 14 publications

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“…This has been indeed convincingly confirmed in an INS experiment on a non-deuterated sample of Mn 6 (Carretta et al, 2008). Experimental INS data recorded in two energy windows are presented in Fig.…”

Section: The Mn6 Clusterssupporting

confidence: 55%

“…53(b), which demonstrates that the energies of the |M states of the S = 12 ground-state multiplet do not follow the generic parabolic M 2 curve but deviate strongly from it at higher energies, and that indeed several higher-lying S = 11 multiplets fall below the top of the S = 12 multiplet. In Carretta et al, 2008 it was further demonstrated that this unique structure of the energy spectrum has significant effects on the magnetic relaxation rates.…”

Section: The Mn6 Clustersmentioning

confidence: 99%

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Magnetic Cluster Excitations

Fürrer

2010

Int. J. Mod. Phys. B

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Magnetic clusters, i.e., assemblies of a finite number (between two or three and several hundred) of interacting spin centers which are magnetically decoupled from their environment, can be found in many materials ranging from inorganic compounds, magnetic molecules, artificial metal structures formed on surfaces to metalloproteins. The magnetic excitation spectra in them are determined by the nature of the spin centers, the nature of the magnetic interactions, and the particular arrangement of the mutual interaction paths between the spin centers. Small clusters of up to four magnetic ions are ideal model systems to examine the fundamental magnetic interactions which are usually dominated by Heisenberg exchange, but often complemented by anisotropic and/or higher-order interactions. In large magnetic clusters which may potentially deal with a dozen or more spin centers, the possibility of novel many-body quantum states and quantum phenomena are in focus. In this review the necessary theoretical concepts and experimental techniques to study the magnetic cluster excitations and the resulting characteristic magnetic properties are introduced, followed by examples of small clusters demonstrating the enormous amount of detailed physical information which can be retrieved. The current understanding of the excitations and their physical interpretation in the molecular nanomagnets which represent large magnetic clusters is then presented, with an own section devoted to the subclass of the singlemolecule magnets which are distinguished by displaying quantum tunneling of the magnetization. Finally, some quantum many-body states are summarized which evolve in magnetic insulators characterized by built-in or field-induced magnetic clusters. The review concludes addressing future perspectives in the field of magnetic cluster excitations.

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Section: The Mn6 Clusterssupporting

confidence: 55%

Section: The Mn6 Clustersmentioning

confidence: 99%

Magnetic Cluster Excitations

Fürrer

2010

Int. J. Mod. Phys. B

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“…We note that recent studies of a Mn 6 SMM have enabled such quantitative comparisons, 65,66 in part because of the reduced dimension of the Hamiltonian matrix for Mn 6 in comparison to Mn 12 .…”

Section: Methodsmentioning

confidence: 99%

Anisotropy barrier reduction in fast-relaxingMn12single-molecule magnets

2009

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A novel angle-swept high-frequency electron paramagnetic resonance (HFEPR) technique is described that facilitates efficient in-situ alignment of single-crystal samples containing lowsymmetry magnetic species such as single-molecule magnets (SMMs). This cavity-based technique involves recording HFEPR spectra at fixed frequency and field, while sweeping the applied field orientation. The method is applied to the study of a low-symmetry Jahn-Teller variant of the extensively studied spin S = 10 Mn 12 SMMs (e.g. Mn 12 -acetate). The lowsymmetry complex also exhibits SMM behavior, but with a significantly reduced effective

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“…This motivated efforts to extend such strategies to larger molecules containing triangular [Mn 3 III -(μ 3 -oxo)] units, resulting in a series of FM Mn 6 III SMMs, which currently hold the record for both blocking temperature and anisotropy barrier for any transition metal-based SMM [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Relieving frustration: The case of antiferromagnetic Mn3molecular triangles

et al. 2011

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Recently, various triangular [Mn III ] 3 molecules have been extensively studied due to the fact that one can modulate the magnitude and the sign of the inter-ion exchange, thereby giving rise to very simple clusters that constitute some of the cleanest and best examples of so-called singlemolecule magnets (SMMs). However, magnetic and electron paramagnetic resonance (EPR) [19,27,30,33]. As we demonstrate in the present study, this can be attributed to the spin frustration inherent to AF triangular systems [34]. Of course, in the case of maximal frustration (perfect equilateral triangle), one anticipates a non-magnetic (S = 0) ground state for the pure Heisenberg case. However, even in cases with significant Ising-type anisotropy, the effects caused by frustration remain, leading to a considerable density of low-lying spin states and to a significant mixing between these states. These factors typically give rise to broad, content-less EPR spectra (see e.g. [17,18]).

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Breakdown of the Giant Spin Model in the Magnetic Relaxation of theMn6Nanomagnets

Cited by 74 publications

References 14 publications

Magnetic Cluster Excitations

Magnetic Cluster Excitations

Anisotropy barrier reduction in fast-relaxingMn12single-molecule magnets

Relieving frustration: The case of antiferromagnetic Mn3molecular triangles

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