Anhydrous copper tellurite disulfate Cu3TeO3(SO4)2 featuring the coexistence of spin singlets and a long-range antiferromagnetic order†
Peter S.
Berdonosov, 
bc
Zlata V.
Pchelkina,
de
Konstantin V.
Zakharov,
f
Tatyana M.
Vasilchikova,
cf
Olga S.
Volkova
cf
and
Alexander N.
Vasiliev
*c
bc
Zlata V.
Pchelkina,
de
Konstantin V.
Zakharov,
f
Tatyana M.
Vasilchikova,
cf
Olga S.
Volkova
cf
and
Alexander N.
Vasiliev
*c
Abstract
Anhydrous copper tellurite sulfate, Cu3TeO3(SO4)2, has been synthesized via vapor transport reactions in sealed silica glass ampoules. In measurements of magnetization M, magnetic susceptibility χ, specific heat Cp and X-band electron spin resonance, a long-range antiferromagnetic order at TN = 13 K and an H–T magnetic phase diagram have been established. One-third of Cu2+ ions were found to form magnetically silent dimers. A peak in dielectric permittivity ε, which accompanies the Néel order, allows considering Cu3TeO3(SO4)2 as a magnetoelectric multiferroic material of the second type. Density functional theory calculations provided estimations of leading exchange interaction parameters.
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