Quantized antiferromagnetic spin waves in the molecular Heisenberg ring<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CsFe</mml:mtext></mml:mrow><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>

Dreiser, Jan; Waldmann, Oliver; Dobe, Christopher; Carver, Graham; Ochsenbein, Stefan T.; Sieber, Andreas; Güdel, Hans U.; Duijn, J. van; Taylor, J. W.; Podlesnyak, A.

doi:10.1103/physrevb.81.024408

Cited by 30 publications

(46 citation statements)

References 80 publications

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“…Inelastic neutron scattering (INS) has provided the means to confirm this model on a variety of even AFM wheels. [10][11][12][13] Additionally, AFM wheels have shown interesting quantum phenomena, such as quantum tunneling oscillations in the homonuclear wheel Fe 18 or coherent oscillation of the total quantum spin at avoided level crossings in applied magnetic fields in the heterometallic AFM wheel Cr 7 Ni. 13,14 As distinguished from the even wheels, the topology of odd-membered AFM wheels is of separate interest because of the possibility of boundary-induced frustration effects.…”

Section: Introductionmentioning

confidence: 99%

Inelastic neutron scattering studies on the odd-membered antiferromagnetic wheel Cr8Ni

et al. 2012

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18 ], or Cr 8 Ni, is a prominent example of an odd-membered antiferromagnetic "wheel." A detailed characterization of the magnetic properties of Cr 8 Ni has been conducted. Inelastic neutron scattering (INS) is used to investigate the energy and momentum transfer dependence of the low-lying spin excitations, including excited states inaccessible by other experimental techniques. The richness of the INS data, in conjunction with microscopic spin Hamiltonian simulations, enables an accurate characterization of the magnetic properties of Cr 8 Ni. Nearest-neighbor exchange constants of J CrCr = 1.31 meV and J CrNi = 3.22 meV are determined, and clear evidence of axial single-ion anisotropy is found. The parameters determined by INS are shown to fit magnetic susceptibility. The spectroscopic identification of several successive S = 1 excited total spin states and lowest spin band excitations show that the rotational band picture, valid for bipartite AFM wheels, breaks down for this odd-numbered wheel. The exchange constants determined here differ from previous efforts based on bulk measurements, and possible reasons are discussed. The large J CrNi /J CrCr ratio in Cr 8 Ni puts this wheel into a regime with strong quantum fluctuations in which the ground state can be described with a valence bond solid state picture.

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Section: Introductionmentioning

confidence: 99%

Inelastic neutron scattering studies on the odd-membered antiferromagnetic wheel Cr8Ni

et al. 2012

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“…The excitation spectrum in CsFe 8 was also probed for energies up to 25 meV in a high-energy INS experiment Dreiser et al, 2010b). Results are shown in Fig.…”

Section: Antiferromagnetic Wheels With "Intermediate" Anisotropymentioning

confidence: 99%

“…Accordingly, the Bose-scaled high-temperature data can estimate the lattice contribution at lower temperatures. Often this works well, especially in large magnetic clusters with a dense higher-lying energy spectrum, and allows an unambiguous identification of magnetic peaks (Dreiser et al, 2010b;Ochsenbein et al, 2008).…”

Section: Inelastic Neutron Scatteringmentioning

confidence: 99%

“…ǫ(q) can be regarded as the finite-size version of the spin-wave dispersion relation (Dreiser et al, 2010b). Indeed, in the infinite chain q would become the wave vector, and ǫ(q) would agree with the familiar spin-wave dispersion (Anderson, 1952).…”

Section: Condensed Matter Techniquesmentioning

confidence: 99%

“…The results of a similar analysis for the CsFe 8 and Fe 18 antiferromagnetic wheels in Sec. IV.C.2 are recalled (Dreiser et al, 2010b;Ummethum et al, 2012). However, as mentioned before, the physics of the magnetic excitations in short antiferromagnetic chains, although displaying a L&E-band structure in the energy spectrum, presents some subtleties which are difficult to understand (Konstantinidis et al, 2011).…”

Section: Short Antiferromagnetic Chainsmentioning

confidence: 99%

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Magnetic Cluster Excitations

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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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Heterometallische Ringe: physikalische Eigenschaften und Verwendung als supramolekulare Bausteine

et al. 2015

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Heterometallische Ringe wurden in großer Zahl hergestellt, angefangen von den ersten Cr7M‐Ringen mit M=NiII, ZnII und MnII bis hin zu Ringen mit vierzehn Metallen in der cyclischen Struktur. Bekannte Beispiele entweder außen durch Carboxylate oder innen durch Fluoride oder ein fünffach deprotoniertes Polyol verbrückt. Die Ringgröße wird durch Template gesteuert, z. B. durch Ammonium‐ oder Imidazoliumionen, Alkalimetalle oder Koordinationsverbindungen. Die Ringe können funktionalisiert werden und wirken dadurch als Liganden, sie lassen sich außerdem zum Aufbau von organisch‐anorganischen Rotaxanen oder von Makromolekülen mit bis zu 200 Metallzentren verwenden. Eine Reihe von physikalischen Studien wurde an heterometallischen Ringen durchgeführt, darunter magnetische Messungen, inelastische Neutronenstreuung (einschließlich Einkristallmessungen), paramagnetische Elektronenresonanzspektroskopie (einschließlich Messungen der Phasengedächtniszeiten), NMR‐Spektroskopie (Lösung und Festkörper) und polarisierte Neutronenstreuung. Die Ringe sind somit ideale Modellsystem, um Einblicke in den Magnetismus bei austauschgekoppelten Systemen zu gewinnen.

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Quantized antiferromagnetic spin waves in the molecular Heisenberg ringCsFe8

Cited by 30 publications

References 80 publications

Inelastic neutron scattering studies on the odd-membered antiferromagnetic wheel Cr8Ni

Inelastic neutron scattering studies on the odd-membered antiferromagnetic wheel Cr8Ni

Magnetic Cluster Excitations

Heterometallische Ringe: physikalische Eigenschaften und Verwendung als supramolekulare Bausteine

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