Existence of the magnetization plateau in a class of exactly solvable Ising-Heisenberg chains
نویسندگان
چکیده
The mapping transformation technique is applied to obtain exact results for the spin-1/2 and spin-S (S = 1/2, 1) Ising-Heisenberg antiferromagnetic chain in the presence of an external magnetic field. Within this scheme, a field-induced first-order metamagnetic phase transition resulting in multiplateau magnetization curves, is investigated in detail. It is found that the scenario of the plateau formation depends fundamentally on the ratio between Ising and Heisenberg interaction constants, as well as on the anisotropy strength of the XXZ Heisenberg interaction. PACS:05.50.+q, 75.10.Jm, 75.10.Hk
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