Physics – Quantum Physics
Scientific paper
2007-11-23
PHYSICAL REVIEW B 77 104402 (2008)
Physics
Quantum Physics
Submited to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.104402
The present work reports an experimental observation of thermal entanglement in a clusterized spin chain formed in the compound Na$_2$Cu$_5$Si$_4$O$_{14}$. The presence of entanglement was investigated through two measured quantities, an Entanglement Witness and the Entanglement of Formation, both derived from the magnetic susceptibility. It was found that pairwise entanglement exists below $ \sim 200$ K. Tripartite entanglement was also observed below $ \sim 240$ K. A theoretical study of entanglement evolution as a function of applied field and temperature is also presented.
Oliveira I. S.
Reis M. S.
Sarthour R. S.
Soares-Pinto Diogo O.
Souza Alexandre M.
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