Experimental Determination of Thermal Entanglement in Spin Clusters using Magnetic Susceptibility Measurements
Abstract
The present work reports an experimental observation of thermal entanglement in a clusterized spin chain formed in the compound Na2Cu5Si4O14. 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 200 K. Tripartite entanglement was also observed below 240 K. A theoretical study of entanglement evolution as a function of applied field and temperature is also presented.
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