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- W2000111700 abstract "The evolution of the spin gap of a 2-leg ladder upon doping depends upon the nature of the lowest triplet excitations in a ladder with two holes. Here we study this evolution using various numerical techniques for a $tensuremath{-}{t}^{ensuremath{'}}ensuremath{-}J$ ladder as the next-near-neighbor hopping ${t}^{ensuremath{'}}$ is varied. We find that depending on the value of ${t}^{ensuremath{'}},$ the spin gap can evolve continuously or discontinuously and the lowest triplet state can correspond to a magnon, a bound magnon-hole-pair, or two separate quasiparticles. Previous experimental results on the superconducting two-leg ladder ${mathrm{Sr}}_{14ensuremath{-}x}{mathrm{Ca}}_{x}{mathrm{Cu}}_{24}{mathrm{O}}_{41}$ are discussed." @default.
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- W2000111700 date "2000-12-01" @default.
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- W2000111700 title "Evolution of the spin gap upon doping a 2-leg ladder" @default.
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- W2000111700 doi "https://doi.org/10.1103/physrevb.62.r14633" @default.
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