Abstract
We investigate magnetic properties of the spin − 1 2 two-leg Heisenberg ladder antiferromagnet developing two formulations, one of which starts from the Jordan–Wigner transformation along an elaborately ordered path, and the other of which modifies the conventional spin-wave theory so as to restore the sublattice symmetry. The static and dynamic quantities are calculated and a novel field dependence of the nuclear spin-lattice relaxation rate, which is peculiar to one-dimensional spin-gapped antiferromagnets, is pointed out in particular.
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