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We investigated the magnetic properties of the system CuTe2O5 bysusceptibility and electron spin resonance measurements. The anisotropy of theeffective g-factors and the ESR linewidth indicates that the anticipatedstructural dimer does not correspond to the singlet-forming magnetic dimer.Moreover, the spin susceptibility of CuTe2O5 can only be described by takinginto account interdimer interactions of the same order of magnitude than theintradimer coupling. Analyzing the exchange couplings in the system we identifythe strongest magnetic coupling between two Cu ions to be mediated bysuper-super exchange interaction via a bridging Te ligand, while thesuperexchange coupling between the Cu ions of the structural dimer only resultsin the second strongest coupling

physical review. b, condensed matter and materials physics

Structural and magnetic dimers in the spin-gapped system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">Te</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>

Structural and magnetic dimers in the spin-gapped systemCuTe2O5