Low-temperature thermal properties of icosahedral Al-Re-Pd
M. A. Chernikov; A. Bianchi; E. Felder; U. Gubler; H. R. Ott; M. A. Chernikov; Laboratorium für Festkörperphysik, ETH-Hönggerberg - CH-8093 Zürich, Switzerland; A. Bianchi; Laboratorium für Festkörperphysik, ETH-Hönggerberg - CH-8093 Zürich, Switzerland; E. Felder; Laboratorium für Festkörperphysik, ETH-Hönggerberg - CH-8093 Zürich, Switzerland; U. Gubler; Laboratorium für Festkörperphysik, ETH-Hönggerberg - CH-8093 Zürich, Switzerland; H. R. Ott; Laboratorium für Festkörperphysik, ETH-Hönggerberg - CH-8093 Zürich, Switzerland
Журнал:
EPL (Europhysics Letters)
Дата:
1996-08-20
Аннотация:
We report measurements of the thermal conductivity λ(T) and the specific heat C<sub>p</sub>(T) of icosahedral Al<sub>70</sub>Re<sub>8.6</sub>Pd<sub>21.4</sub> at low temperatures. Below 1 K, the behaviour of the quasilattice thermal conductivity λ<sub>ph</sub>(T) is compatible with the scattering of vibrational excitations involving tunnelling states and grain boundaries. The specific heat C<sub>p</sub>(T) contains a small linear contribution γ T. Our λ<sub>ph</sub>(T) results indicate that a substantial part of γ T may be attributed to the excitations of tunnelling states. Below 0.4 K C<sub>p</sub>(T) increases with decreasing T and at the lowest temperatures it varies as T<sup>−2</sup>, suggestive of an interaction of the quadrupolar moments of <sup>185</sup>Re and <sup>187</sup>Re nuclei with the gradient of electric fields induced by their neighbours.
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