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Bulk electronic structure of high-order quaternary approximants

Shuvam Sarkar, Pampa Sadhukhan, Vipin Kumar Singh, Andrei Gloskovskii, Kazuhiko Deguchi, Nobuhisa Fujita, and Sudipta Roy Barman
Phys. Rev. Research 3, 013151 – Published 16 February 2021
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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 iAlPdMn, 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.

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  • Received 30 June 2020
  • Accepted 21 January 2021

DOI:https://doi.org/10.1103/PhysRevResearch.3.013151

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shuvam Sarkar1, Pampa Sadhukhan1, Vipin Kumar Singh1, Andrei Gloskovskii2, Kazuhiko Deguchi3, Nobuhisa Fujita4, and Sudipta Roy Barman1

  • 1UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, Madhya Pradesh, India
  • 2Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg, Germany
  • 3Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
  • 4Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

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Vol. 3, Iss. 1 — February - April 2021

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