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Phase Transitions in Staggered Spin Ladders
1996
Physical Review Letters
We map spin ladders with n l legs and couplings J 0 across all rungs and J͑1 6 g͒ along the legs, staggered in both directions, to a sigma model. Setting its u ͑2m 1 1͒p (where it is known to be gapless), we locate the critical curves in the g versus J 0 ͞J plane at each n l , and spin S. The phase diagram is rich and has some surprises: When two gapped chains are suitably coupled, the combination becomes gapless. With n l , g, and J 0 ͞J to control, the prospects for experimentally observing
doi:10.1103/physrevlett.77.3443
pmid:10062221
fatcat:qio6juii5zd7zhnnycj57e2mv4