Bulk electronic structure of high-order quaternary approximants

Shuvam Sarkar, Pampa Sadhukhan, Vipin Kumar Singh, Andrei Gloskovskii, Kazuhiko Deguchi, Nobuhisa Fujita, Sudipta Roy Barman

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    1 Citation (Scopus)

    Abstract

    The bulk electronic structures of two high-order quaternary approximants of F-type icosahedral (i)-Al-Pd-TM quasicrystal: Al-Pd-Cr-Fe and Al-Pd-Mo-Fe, having similar electron to atom (e/a) ratio as i-Al-Pd-Mn quasicrystal, have been investigated by hard x-ray photoelectron spectroscopy. We establish the presence of a well-formed pseudogap at the Fermi level in both the approximants. The pseudogap turns out to be deeper in the approximants compared to i-Al-Pd-Mn, and this is supported by specific heat data. Modifications in the line shape of Al 2s core-level main peak as well as the plasmon loss peaks indicate enhanced hybridization of Al sp and transition metal d states in the approximants, which could be one of the possible reasons for their pseudogap. The absence of magnetic exchange splitting in the Fe 2p core-level spectra establishes the nonmagnetic nature of the approximants.

    Original languageEnglish
    Article number013151
    JournalPhysical Review Research
    Volume3
    Issue number1
    DOIs
    Publication statusPublished - 2021 Feb 16

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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