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The mixed spin-(1/2,1) Ising chain with axial and rhombic zero-fieldsplitting parameters in a presence of the longitudinal magnetic field isexactly solved within the framework of decoration-iteration transformation andtransfer-matrix method. Our particular emphasis is laid on an investigation ofthe influence of the rhombic term, which is responsible for an onset of quantumentanglement between two magnetic states S_k^z = 1 and -1 of the spin-1 atoms.It is shown that the rhombic term gradually destroys a classical ferrimagneticorder in the ground state and simultaneously causes diversity in magnetizationcurves including intermediate plateau regions, regions with a continuous changein the magnetization as well as several unusual field-induced transitionsaccompanied with magnetization jumps. Another interesting findings concern withan appearance of the round minimum in the temperature dependence ofsusceptibility times temperature data, the double-peak zero-field specific heatcurves and the enhanced magnetocaloric effect. The temperature dependence ofthe specific heat with three separate maxima may also be detected when drivingthe system through the axial and rhombic zero-field splitting parameters closeenough to a phase boundary between the ferrimagnetic and disordered states andapplying sufficiently small longitudinal magnetic field.

Unusual field-induced transitions in exactly solved mixed spin-(1/2,1) Ising chain with axial and rhombic zero-field splitting parameters