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The thermal entanglement in a two-spin-qutrit system with two spins coupledby exchange interaction under a magnetic field in an arbitrary direction isinvestigated. Negativity, the measurement of entanglement, is calculated. Wefind that for any temperature the evolvement of negativity is symmetric withrespect to magnetic field. The behavior of negativity is presented for fourdifferent cases. The results show that for different temperature, differentmagnetic field give maximum entanglement. Both the parallel and antiparallelmagnetic field cases are investigated qualitatively (not quantitatively) indetail, we find that the entanglement may be enhanced under an antiparallelmagnetic field.Comment: 2 eps figure

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Thermal entanglement in a two-spin-qutrit system under a nonuniform external magnetic field