High temperature thermal conductivity of 2-leg spin-1/2 ladders
Abstract
Based on numerical simulations, a study of the high temperature, finite frequency, thermal conductivity (ω) of spin-1/2 ladders is presented. The exact diagonalization and a novel Lanczos technique are employed.The conductivity spectra, analyzed as a function of rung coupling, point to a non-diverging dc-limit but to an unconventional low frequency behavior. The results are discussed with perspective recent experiments indicating a significant magnetic contribution to the energy transport in quasi-one dimensional compounds.
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