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Thermal conductivity of the hole-doped spin ladder system Sr14-xCaxCu24O41
Sologubenko1, Gianno, Ott
1Laboratorium fur Festkorperphysik, ETH Honggerberg, CH-8093 Zurich, Switzerland.
Abstract:
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 kappa(a) 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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