  We study the ground state properties of one-dimensional XXZ model with
next-nearest neighbor coupling alpha and anisotropy Delta. We find the direct
transition between the ferromagnetic phase and the spontaneously dimerized
phase. This is surprising, because the ferromagnetic phase is classical,
whereas the dimer phase is a purely quantum and nonmagnetic phase. We also
discuss the effect of bond alternation which arises in realistic systems due to
lattice distortion. Our results mean that the direct transition between the
ferromagnetic and spin-Peierls phase occur.
