Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 12, Pages 2714-2717Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2714
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The thermal conductivity of the spin-1/2 ladder system Sr14-xCaxCu24O41 (x = 0, 2, and 12) has been measured both along (kappa(c)) and perpendicular to ( kappa(a)) the ladder direction at temperatures between 5 and 300 K. While the temperature dependence of K, is typical for phonon heat transport, an unusual double-peak structure is observed for kappa(c)(T). We interpret this: unexpected feature as a manifestation of quasi-one-dimensional magnon thermal transport mediated by spin excitations along the ladders.
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