Abstract
In order to study the entanglement properties of mixed-spin systems, taking Negativity as a measure of quantum entanglement, it is studied in (1/2, 1) mixed-spin XY systems. It is found that both ferromagnetic or antiferromagnetic cases, the Negativity of systems decreases with increasing temperature and finally changes to zero smoothly. An interesting phenomenon is that the temperature T0 (defined as the characteristic temperature) at which the Negativity becomes zero is low when the value of the crystal field parameter D is large. The relation between the thermal entanglement(T→0) and ground-state entanglement with two and three sites is studied, respectively. It is also found that the mixed-state entanglement and the thermal entanglement at T→0 can be well corresponding in both systems studied; but the Negativity in pure state and that in mixed state are quite different in the system with two sites.
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