Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O11 center dot 2H(2)O and Na2Cu2Si4O11


The copper silicate Na(2)Cu(2)Si(4)O(11)center dot 2H(2)O and its dehydrated form Na2Cu2Si4O11 exhibit a singlet ground state at low temperature, which is conditioned by the topology of the isolated edge-sharing CuO6 (or CuO5) chains. The structural analysis of the hydrated and dehydrated forms indicates a strong alternation of the exchange interaction parameter within these chains. The magnetic susceptibility and specific heat measurements confirm spin gaps Delta=96 K for Na(2)Cu(2)Si(4)O(11)center dot 2H(2)O and Delta=85 K for Na2Cu2Si4O11. The reversible dehydration of the water molecules from the microporous framework in the structure affords unique opportunity for tuning the magnetic interaction parameters in these compounds.






dos Santos, AM; Amaral, VS; Brandao, P; Paz, FAA; Rocha, J; Ferreira, LP; Godinho, M; Volkova, O; Vasiliev, A

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