Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O11 center dot 2H(2)O and Na2Cu2Si4O11
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
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 3.575
5 year journal impact factor 3.511
category normalized journal impact factor percentile 70.187
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg