An iron(iii) phosphonate cluster containing a nonanuclear ring

Yao, Hong-Chang; Wang, Junjie; Ma, Yunsheng; Waldmann, Oliver; Du, Wentao; Song, You; Li, Yi‐Zhi; Zheng, Li‐Min; Decurtins, Silvio; Xin, Xinquan

doi:10.1039/b600763e

Cited by 94 publications

(46 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yet, recently a number of such rings, both homo-and heterometallic were reported [30,33,34]. They are especially interesting because of magnetic frustration which is expected to appear in this kind of materials.…”

Section: Frustration In the Models Of Cr N Ringsmentioning

confidence: 99%

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

et al. 2012

View full text Add to dashboard Cite

In this paper we review our results of comprehensive study of molecular nanomagnets recently synthesized in the form of the chromium-based molecules and bimetallic copper-containing chains as well as we present some new ndings. We focus on eects of anisotropy, geometry and frustration appearing in various thermodynamic properties of the nanoscale magnets which are described by Heisenberg-like spin models and simulated by accurate numerical methods. We show that bond-dependent exchange anisotropy is needed to model magnetic torque in the Cd-doped chromium ring. We argue that only in the limit of innite rings (n → ∞) frustration can be considered as the opposite to bipartiteness in the odd numbered (3 ≤ n ≤ 9) s = 3/2 quantum spin rings. We analyse the inuence of exchange interactions and anisotropy on magnetic susceptibility of bimetallic (S = 3/2, s = 1/2) chains composed of Cu ions linked to dierent 3d ions by tting experimental data. We reach the remarkable consistency of the density functional theory estimates of the magnetic couplings in Cr8 molecule and provide strong support to the spin models exploited in the literature.

show abstract

Section: Frustration In the Models Of Cr N Ringsmentioning

confidence: 99%

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

et al. 2012

View full text Add to dashboard Cite

show abstract

“…With this replacement the Hamiltonian becomes a classical functional, and the ground-state energy and spin configuration is obtained by minimization. Also, thermodynamic quantities can be calculated for quite large magnetic clusters of hundreds of sites, and it is here where the classical approach was mostly applied to molecular nanomagnets (Müller et al, 2001a;Schröder et al, 2005a;Yao et al, 2006). The calculation of dynamic quantities is also possible (Luscombe and Luban, 1997;Luscombe et al, 1998), but the discrete energies of the excitations in magnetic clusters can of course not be recovered, though their intensities (Mentrup et al, 2000).…”

Section: Condensed Matter Techniquesmentioning

confidence: 99%

“…Important classes such as odd-membered wheels (Cador et al, 2004;Hoshino et al, 2009b;Yao et al, 2006), ferromagnetic clusters (Clemente-Juan et al, 1999;Low et al, 2006;Stuiber et al, 2011), discs (Hoshino et al, 2009a;Koizumi et al, 2007), and others are not mentioned.…”

Section: A Introductionmentioning

confidence: 99%

Magnetic Cluster Excitations

Fürrer

2010

Int. J. Mod. Phys. B

View full text Add to dashboard Cite

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.

show abstract

“…As expected, our calculations for systems with a reduced number of chromium ions (Cr 6 Ni, Cr 4 Ni) showed a negligible impact of anisotropy on the averaged magnetic susceptibility due to the relatively low value of anisotropy for chromium and nickel. In the range of temperature for which experimental results have been obtained for Cr 8 Ni [7,13], the susceptibility curve of Cr 6 Ni theoretical ring for zero anisotropy practically coincides with that calculated for a non-zero anisotropy and then averaged, as shown in Fig. 2.…”

Section: Models and Methods Appliedmentioning

confidence: 79%

“…The model of Cr 8 Ni molecule is presented on Fig. 1 and is described by the following Heisenberg Hamiltonian:…”

Section: Models and Methods Appliedmentioning

confidence: 99%

Non-uniform coupling model of the frustrated chromium-based ring Cr₈Ni

Antkowiak

Kucharski

Kamieniarz

2014

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. A numerically exact spin-Hamiltonian approach has been proposed for the frustrated Cr 8 Ni molecule. The non-uniform exchange couplings parameters, improving the fit of the experimental magnetic susceptibility data, have been obtained, using a genetic algorithm search procedure. The energy intervals between the lowest multiplets, relevant for envisaged transitions observable in the INS spectra, have been determined and the critical fields corresponding to the first-level crossing have been estimated in agreement with experiment.

show abstract

An iron(iii) phosphonate cluster containing a nonanuclear ring

Cited by 94 publications

References 30 publications

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

Magnetic Cluster Excitations

Non-uniform coupling model of the frustrated chromium-based ring Cr₈Ni

Contact Info

Product

Resources

About

An iron(iii) phosphonate cluster containing a nonanuclear ring

Cited by 94 publications

References 30 publications

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

Magnetic Cluster Excitations

Non-uniform coupling model of the frustrated chromium-based ring Cr8Ni

Contact Info

Product

Resources

About

Non-uniform coupling model of the frustrated chromium-based ring Cr₈Ni