Ground-state magnetization curve of a generalized spin-1/2 ladder

Details Ground-state magnetization curve of a generalized spin-1/2 ladder Ground-state magnetization curve of a generalized spin-1/2 ladder

1997-12-26

arxiv.org/abs/cond-mat/9712297v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages; 2 JPG figures; plain TEX; to be published in Physica B (Proc. 5th Int. Symp. on Research in High Magnetic Fields, Syd

Scientific paper

10.1016/S0921-4526(97)00937-X

Employing a method of exact diagonalization for finite-size systems, we investigate the magnetization curve in the ground state of an antiferromagnetic spin-1/2 ladder with additional exchange interactions on diagonal bonds, which is equivalent to an antiferromagnetic spin-1/2 chain with bond-alternating nearest-neighbor and uniform next-nearest-neighbor interactions. It is found that a half-plateau appears in the magnetization curve in a certain range of the interaction constants. This result is discussed in connection with the necessary condition for the appearance of the plateau, recently given by Oshikawa et al.

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