Phys. Rev. Lett. 84, 2714–2717 (2000)Thermal Conductivity of the Hole-Doped Spin Ladder System Sr14-xCaxCu24O41Received 15 September 1999; published in the issue dated 20 March 2000 The thermal conductivity of the spin-1/2 ladder system Sr14-xCaxCu24O41 ( x = 0, 2, and 12) has been measured both along ( κc) and perpendicular to ( κa) the ladder direction at temperatures between 5 and 300 K. While the temperature dependence of κa is typical for phonon heat transport, an unusual double-peak structure is observed for κc(T). We interpret this unexpected feature as a manifestation of quasi-one-dimensional magnon thermal transport mediated by spin excitations along the ladders. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.2714
DOI:
10.1103/PhysRevLett.84.2714
PACS:
75.40.Gb, 66.70.+f, 74.72.Jt
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