Evolution of the Spin Gap Upon Doping a 2-Leg Ladder

Details Evolution of the Spin Gap Upon Doping a 2-Leg Ladder Evolution of the Spin Gap Upon Doping a 2-Leg Ladder

2000-05-24

arxiv.org/abs/cond-mat/0005403v1

Physics

Condensed Matter

4 pages, latex, submitted to PRL

Scientific paper

10.1103/PhysRevB.62.R14633

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 t-t'-J ladder as the next-near-neighbor hopping t' is varied. We find that depending on the value of t', 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 quasi-particles. Previous experimental results on the superconducting two-leg ladder Sr12Ca2Cu24O41 are discussed.

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