Low-temperature thermal properties of icosahedral Al-Re-Pd
für Festkörperphysik, ETH-Hönggerberg - CH-8093 Zürich, Switzerland
Accepted: 3 July 1996
We report measurements of the thermal conductivity and the specific heat of icosahedral at low temperatures. Below 1 K, the behaviour of the quasilattice thermal conductivity is compatible with the scattering of vibrational excitations involving tunnelling states and grain boundaries. The specific heat contains a small linear contribution γ T. Our results indicate that a substantial part of γ T may be attributed to the excitations of tunnelling states. Below 0.4 K increases with decreasing T and at the lowest temperatures it varies as T-2, suggestive of an interaction of the quadrupolar moments of and nuclei with the gradient of electric fields induced by their neighbours.
PACS: 61.44.Br – Quasicrystals / 65.40.+g – Heat capacities of solids / 66.70.+f – Nonelectronic thermal conduction and heat-pulse propagation in nonmetallic solids
© EDP Sciences, 1996