Abstract
We have studied the ground-state phase diagram of a two-leg spin ladder with anisotropicferromagnetic leg couplings under the influence of a symmetry-breaking transversemagnetic field by the exact diagonalization technique. In the case of antiferromagneticcoupling between legs we identified two phase transitions in the plane of magnetic fieldversus interchain coupling strength. The first corresponds to the transition from the gappedrung-singlet phase to the gapped stripe-ferromagnetic phase. The second represents thetransition from the gapped stripe-ferromagnetic phase into the fully polarizedferromagnetic phase.
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