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

Abstract

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.

9 pages; 2 JPG figures; plain TEX; to be published in Physica B (Proc. 5th Int. Symp. on Research in High Magnetic Fields, Sydney, 1997)

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