Competition Between Stripes and Pairing in a t-t'-J Model

Details Competition Between Stripes and Pairing in a t-t'-J Model Competition Between Stripes and Pairing in a t-t'-J Model

1998-12-11

arxiv.org/abs/cond-mat/9812187v2

Physics

Condensed Matter

Strongly Correlated Electrons

Four pages, four encapsulated figures

Scientific paper

10.1103/PhysRevB.60.R753

As the number of legs n of an n-leg, t-J ladder increases, density matrix renormalization group calculations have shown that the doped state tends to be characterized by a static array of domain walls and that pairing correlations are suppressed. Here we present results for a t-t'-J model in which a diagonal, single particle, next-near-neighbor hopping t' is introduced. We find that this can suppress the formation of stripes and, for t' positive, enhance the d_{x^2-y^2}-like pairing correlations. The effect of t' > 0 is to cause the stripes to evaporate into pairs and for t' < 0 to evaporate into quasi-particles. Results for n=4 and 6-leg ladders are discussed.

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