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Electron localization in metallic quasicrystals.

F S Pierce, S J Poon, Q Guo

    Science (New York, N.Y.)
    |August 6, 1993
    PubMed
    Summary
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    High-quality quasicrystalline aluminum-palladium-rhenium alloys show extremely high electrical resistivity, behaving as insulators at low temperatures, unlike typical metals. This suggests unique electronic properties in these ordered metallic systems.

    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Solid-State Chemistry

    Background:

    • Quasicrystalline alloys, such as aluminum-palladium-rhenium (Al-Pd-Re), possess unique atomic structures.
    • Understanding the electronic properties of these materials is crucial for potential applications.

    Purpose of the Study:

    • To investigate the low-temperature electrical resistivity of bulk icosahedral-quasicrystalline Al-Pd-Re alloys.
    • To determine if these alloys exhibit insulating behavior at low temperatures.

    Main Methods:

    • Synthesis of high-quality, thermally stable bulk quasicrystalline Al-Pd-Re alloys.
    • Measurement of low-temperature electrical resistivity.
    • Analysis of electron density and comparison with theoretical models.

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    Main Results:

    • Observed electrical resistivities four orders of magnitude higher than disordered metals and metallic glasses.
    • Experimental evidence suggesting semimetallic electron density.
    • Indication of insulating behavior at low temperatures.

    Conclusions:

    • Quasicrystalline Al-Pd-Re alloys demonstrate significantly reduced conductivity at low temperatures.
    • Findings support theories of electron localization and band-gap formation in ordered metallic systems.
    • These materials represent a unique class of semimetallic insulators.