Evolution of the spin gap upon doping a 2-leg ladder

Article

关键词: T-J LADDERS;    SUPERCONDUCTING CORRELATIONS;    EXCITATION SPECTRUM;    PHOTOEMISSION;    DENSITY;    HOLE;   

DOI  :  10.1103/PhysRevB.62.R14633

来源: SCIE

【 摘 要 】

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 quasiparticles. previous experimental results on the superconducting two-leg ladder Sr14-xCaxCu24O41 are discussed.

【 授权许可】

Free