Article citationsMore>>
Moretti Sala, M., Bisogni, V., Aruta, C., Balestrino, G., Berger, H., Brookes, N.B., DeLuca, G.M., Castro, D.D., Grioni, M., Guarise, M., Medaglia, P.G., Miletto Granozio, F., Minola, M., Perna, P., Radovic, M., Sallustro, M., Schmitt, T., Zhou, K.J., Braikovic, L. and Ghiringhelli, G. (2011) Energy and Symmetry of DD Excitations in Undoped Layered Cuprates Measured by Cu L3 Resonant Inelastic X-Ray Scattering. New Journal of Physics, 13, 1-25.
https://doi.org/10.1088/1367-2630/13/4/043026
has been cited by the following article:
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TITLE:
Crystal Growth of Cu6(Ge,Si)6O18·6H2O and Assignment of UV-VIS Spectra in Comparison to Dehydrated Dioptase and Selected Cu(II) Oxo-Compounds Including Cuprates
AUTHORS:
Hans Hermann Otto
KEYWORDS:
Dioptase, Ge-Dioptase, Copper(II) Compounds, Cuprates, Crystal Growth, UV-VIS Spectroscopy, EPR, Color, d-d Excitations, Bond Strength, Super-Exchange Interaction
JOURNAL NAME:
World Journal of Condensed Matter Physics,
Vol.7 No.3,
August
21,
2017
ABSTRACT: Low-dimensional quantum spin
systems with the Cu2+ central ion are still in the focus of
experimental and theoretical research. Here is reported on growth of mm-sized
single-crystals of the low-dimensional S = 1/2 spin compound Cu6(Ge,Si)6O18·6H2O by a diffusion technique in
aqueous solution. A route to form Si-rich crystals down to possible dioptase,
the pure silicate, is discussed. Motivated by previously reported incorrect
assignments of UV-VIS spectra, the
assignment of dd excitations from such
spectra of the hexahydrate and the fully dehydrated compound is proposed in
comparison to dioptase and selected Cu(II) oxo-compounds using bond strength
considerations. Non-doped cuprates as layer
compounds show higher excitation energies than the title compound. However,
when the antiferromagnetic interaction energy as Jz·ln(2) is
taken into account for cuprates, a single linear relationship between the Dqe excitation energy and
equatorial Cu(II)-O bond strength is confirmed for all compounds. A linear
representation is also confirmed between 2A1g energies and a function of axial and equatorial Cu-O
bond distances if auxiliary axial bonds are used for four-coordinated
compounds. The quotient Dt/Ds of experimental orbital energies deviating from the general trend to
smaller values indicates the existence of H2O respectively Cl− axial ligands in comparison to oxo-ligands, whereas larger Dt/Dqe values
indicate missing axial bonds. The quotient of the excitation energy 2A1g by 2·2Eg-2B2g allows checking for correctness of
the assignment and to distinguish between axial oxo-ligands and others like H2O
or Cl−.
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