abstract
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
keywords
QUANTUM; STATES; DYNAMICS
subject category
Physics
authors
Soares-Pinto, DO; Souza, AM; Sarthour, RS; Oliveira, IS; Reis, MS; Brandao, P; Rocha, J; dos Santos, AM
our authors
João Rocha
Director
Paula Cristina Ferreira da Silva Brandão
ResearcherGroups
1 - Inorganic Functional Nanomaterials and Organic-Inorganic Hybrids
5 - Biomedical and Biomimetic Materials
acknowledgements
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.