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

abstract

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.

keywords

LINEAR-CHAIN; TRANSITION; COMPOUND

subject category

Physics

authors

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

our authors

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