authors |
dos Santos, AM; Amaral, VS; Brandao, P; Paz, FAA; Rocha, J; Ferreira, LP; Godinho, M; Volkova, O; Vasiliev, A |
nationality |
International |
journal |
PHYSICAL REVIEW B |
keywords |
LINEAR-CHAIN; TRANSITION; COMPOUND |
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. |
publisher |
AMERICAN PHYSICAL SOC |
issn |
1098-0121 |
year published |
2005 |
volume |
72 |
issue |
9 |
digital object identifier (doi) |
10.1103/PhysRevB.72.092403 |
web of science category |
Physics, Condensed Matter |
subject category |
Physics |
unique article identifier |
WOS:000232228500010
|