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E. Solano-Carrillo 《Journal of magnetism and magnetic materials》2010,322(23):3760-1960
We investigate the physical processes which give rise to a multi-plateau ground-state magnetization curve in ferrimagnetic Ising chains with alternating spins (S,s) and different single-ion anisotropies on each sublattice of the system under an applied magnetic field, by using an elaboration of the molecular-field theory. Our analysis is started with the system () for which we use the transfer-matrix technique for comparison. In this system, we find a double-plateau structure (initial and saturation) in the magnetization curve for all values of , independent of anisotropies. Then we study two more elaborate systems, comparing the results with density-matrix renormalization group calculations, and finally generalize our argument to the general case. We find that for a specified range of the anisotropy parameters, the system exhibits 2s+1 plateaux, including the two classical and all those allowed for general quantum spin chains. This follows a similar rule as that known for spin-S(S≥1) Ising chains with single-ion anisotropy, for which 2S+1 plateaux appear in the ground-state magnetization curve, surviving even at low temperatures. 相似文献
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J.C. Martinez M.B.A. Jalil 《Physics letters. A》2011,375(24):2437-2440
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P. VingerhoetsK.T. Flanagan J. BillowesM.L. Bissell K. BlaumB. Cheal M. De RydtD.H. Forest Ch. GeppertM. Honma M. KowalskaJ. Krämer K. KreimA. Krieger R. NeugartG. Neyens W. Nörtershäuser J. PapugaT.J. Procter M.M. RajabaliR. Sánchez H.H. StrokeD.T. Yordanov 《Physics letters. [Part B]》2011,703(1):34-39