Evidence for non glass-like behavior of i-AlPdMn quasicrystals from low-temperature thermal conductivity

Details Evidence for non glass-like behavior of i-AlPdMn quasicrystals from low-temperature thermal conductivity Evidence for non glass-like behavior of i-AlPdMn quasicrystals from low-temperature thermal conductivity

2003-07-18

arxiv.org/abs/cond-mat/0307458v1

Physics

Condensed Matter

7 pages, 3 figures, RevTeX

Scientific paper

The thermal conductivities of three single-grain i-AlPdMn quasicrystals, with different compositions and grown by different growth techniques, were studied. The electronic contribution to the thermal conductivity was estimated using the law of Wiedemann and Franz. At low temperatures, below 40 K, the quasilattice thermal conductivity, obtained by subtracting the electronic from the total thermal conductivity, was analyzed by means of the Debye model. At the lowest temperatures the Casimir regime is reflected by phonon mean free paths of the order of the sample dimensions. The dominant scattering at low temperatures is not due to tunneling states, but is caused by stacking-fault-like defects. This confirms that the low-temperature lattice excitation dynamics in quasilattices is more crystal- than glass-like. Above 60 K the thermal conductivity curves deviate from the Debye model due to hopping of localized vibrational modes which results in the opening of a new heat-carrying channel.

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