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Investigation of the oxohalide Cu4Te5O12Cl4 with weakly coupled Cu(II) tetrahedra

MPS-Authors
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Johnsson,  M.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280221

Lemmens,  P.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Takagi, R., Johnsson, M., Gnezdilov, V., Kremer, R. K., Brenig, W., & Lemmens, P. (2006). Investigation of the oxohalide Cu4Te5O12Cl4 with weakly coupled Cu(II) tetrahedra. Physical Review B, 74(1): 014413.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FC3E-2
Abstract
The crystal structure of the copper(II) tellurium(IV) oxochloride
Cu4Te5O12Cl4 (Cu-45124) is composed of weakly coupled tetrahedral Cu
clusters and shows crystallographic similarities with the intensively
investigated compound Cu2Te2O5X2, with X=Cl,Br (Cu-2252). It differs
from the latter by a larger separation of the tetrahedra within the
crystallographic ab plane, that allows a more direct assignment of
important intertetrahedra exchange paths and the existence of an
inversion center. Magnetic susceptibility and specific heat evidence
antiferromagnetic, frustrated correlations of the Cu spin moments and
long range ordering with T-c=13.6 K. The entropy related to the
transition is reduced due to quantum fluctuations. In Raman scattering
a well structured low energy magnetic excitation is observed at
energies of approximate to 50 K (35 cm(-1)). This energy scale is
reduced as compared to Cu-2252.