resumo
In the present work, we investigate the quantum thermal entanglement in molecular magnets composed of dimers of spin S, using an Entanglement Witness built from measurements of magnetic susceptibility. An entanglement temperature, T-e, is then obtained for some values of spin S. From this, it is shown that T-e is proportional to the intradimer exchange interaction J and that entanglement appears only for antiferromagnetic coupling. The results are compared to experiments carried on three isostructural materials: KNaMSi4O10 (M=Mn, Fe or Cu). Copyright (C) EPLA, 2009
palavras-chave
QUANTUM; STATES; DYNAMICS
categoria
Physics
autores
Soares-Pinto, DO; Souza, AM; Sarthour, RS; Oliveira, IS; Reis, MS; Brandao, P; Rocha, J; dos Santos, AM
nossos autores
João Rocha
Diretor
Paula Cristina Ferreira da Silva Brandão
InvestigadorGrupos
1 - Nanomateriais inorgânicos funcionais e híbridos orgânico-inorgânico
5 - materiais biomédicos e biomiméticos
agradecimentos
The authors thank T. G. RAPPOPORT and T.J. BONAGAMBA for their comments. We would like to thank the Brazilian funding agencies CNPq, CAPES and the Brazilian Millennium Institute for Quantum Information. DOSP acknowledges the financial support from FAPESP. AMS acknowledges the government of Ontario. MSR acknowledges the financial support from the PCI-CBPF program.