Magnetic excitations in two-leg spin 1/2 ladders: experiment and theory

Details Magnetic excitations in two-leg spin 1/2 ladders: experiment and theory Magnetic excitations in two-leg spin 1/2 ladders: experiment and theory

2001-09-27

arxiv.org/abs/cond-mat/0109524v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 7 eps figures, submitted to SNS 2001

Scientific paper

Magnetic excitations in two-leg S=1/2 ladders are studied both experimentally and theoretically. Experimentally, we report on the reflectivity, the transmission and the optical conductivity sigma(omega) of undoped La_x Ca_14-x Cu_24 O_41 for x=4, 5, and 5.2. Using two different theoretical approaches (Jordan-Wigner fermions and perturbation theory), we calculate the dispersion of the elementary triplets, the optical conductivity and the momentum-resolved spectral density of two-triplet excitations for 0.2 <= J_parallel/J_perpendicular <= 1.2. We discuss phonon-assisted two-triplet absorption, the existence of two-triplet bound states, the two-triplet continuum, and the size of the exchange parameters.

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