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Source of magnetic anisotropy in quasi-two-dimensional XY $\{ Cu_4(tetrenH_5)W(CN)_8]_4 ⋅7.2 H_{2}O)\}_n$ bilayer molecular magnet
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dc.type
JournalArticle
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dc.abstract.en
To identify the origin of the XY spin dimensionality in the bilayered system {Cu4(tetrenH5)[W(CN)8]4⋅7.2H2O}n (WCuT) we use a combination of single-crystal experiments (bulk magnetization, neutron flipping ratio, electron magnetic resonance, neutron diffraction) and theoretical modeling (exchange-charge model of the crystal field, dipolar energy, and density functional calculations). Our experiments show that the magnetic properties of WCuT are anisotropic and two-dimensional correlations build up below 70 K. The hard anisotropy axis is perpendicular to the layers (b axis) and a small anisotropy within the ac layers is present. Modeling of the crystal field validates treatment of tungsten and copper as spin S=12 ions with anisotropic g values. The local magnetic anisotropy results from the common action of the crystal field and spin-orbit coupling and is along the c axis for both ions. Density functional calculations identify the origin of the ferromagnetic exchange in different energies and symmetries of the tungsten- and copper-dominated orbitals and anticipate different exchange couplings across the apical (along the b axis) and equatorial (in the ac plane) Cu-CN-W bridges due to difference in the hybridization efficiency. Calculation of the dipolar energy for various spin configurations suggests that dipolar interactions play a decisive role in the ac-planar anisotropy in this system. We propose that the effective XY spin dimensionality in WCuT is established by a combination of the axial local anisotropy of the W and Cu ions and the long-range magnetic dipolar interactions on the bilayered square lattice.
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dc.description.volume
87
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dc.description.number
2
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dc.identifier.doi
10.1103/PhysRevB.87.024406
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dc.identifier.eissn
1550-235X
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dc.identifier.eissn
1538-4489
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dc.title.journal
Physical Review. B, Condensed Matter and Materials Physics
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dc.language.container
eng
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dc.affiliation
Wydział Chemii : Zakład Chemii Nieorganicznej
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dc.subtype
Article
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dc.identifier.articleid
024406
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dc.rights.original
bez licencji
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.pointsMNiSW
[2013 A]: 35
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