Recent results at the metal-insulator transition of icosahedral AlPdRe

Rapp, Ö.; Srinivas, V.; Poon, S. J.

doi:10.1080/14786430500311758

Cited by 3 publications

(1 citation statement)

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“…In quasicrystals of the Al-Pd-Re system, the only system where the T -1/4 law has been observed so far, there is no such unambiguity. With rare exceptions, this law is observed in the range of ultralow temperatures bounded both from above and from below [9][10][11][12], so that the experimental curves σ(T) in the range of low temperatures (T ≲ 1 K) are approximated by Mott formula for VRH conductivity, modified by adding a metal-like contribution σ 0 in the form (1) Here, σ 0 is an adjustable parameter; the rest notations are commonly accepted.…”

Section: Introductionmentioning

confidence: 99%

On Modified Mott (Т–1/4) Law in the Conductivity of Quasicrystals

Prekul

Shchegolikhina

2021

Phys. Metals Metallogr.

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In the conductivity of quasicrystals, modified with a metal additive, numerous cases of manifestation of the Mott Т -1/4 law have been found. In the icosahedral phases of the Al-Pd-Re system, this anomaly is observed not only in the limit of the marginal metallic conductivity, as was known until now, but long before this limit is reached. It is also shown that similar anomalies are characteristic of the Al-Cu-Fe system of quasicrystalline alloys, the level of metallic conductivity of which is two to three orders of magnitude higher than that in polycrystalline Al-Pd-Re materials. It is assumed that these anomalies are the manifestation of a wide distribution of two-level excitations of "chemically" localized electrons.

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