Thermal conductivity of Mg-doped CuGeO_3 at very low temperatures: Heat conduction by antiferromagnetic magnons
arXiv:cond-mat/0004367 · doi:10.1103/PhysRevB.62.R9260
Abstract
Thermal conductivity κis measured at very low temperatures down to 0.28 K for pure and Mg-doped CuGeO_3 single crystals. The doped samples carry larger amount of heat than the pure sample at the lowest temperature. This is because antiferromagnetic magnons appear in the doped samples and are responsible for the additional heat conductivity, while κof the pure sample represents phonon conductivity at such low temperatures. The maximum energy of the magnon is estimated to be much lower than the spin-Peierls-gap energy. The result presents the first example that κat very low temperatures probes the magnon transport in disorder-induced antiferromagnetic phase of spin-gap systems.
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Cited by in corpus (14)
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