Electronic structure of quasicrystals studied by ultrahigh-energy-resolution photoemission spectroscopy

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.10938· OSTI ID:561604

Stadnik, Z M ^[1]; Purdie, D; Garnier, M; Baer, Y ^[2]; Tsai, A ^[3]; Inoue, A ^[4]; Edagawa, K ^[5]; Takeuchi, S ^[6]; Buschow, K H ^[7]

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1. Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5 (Canada)
2. Institut de Physique, Universite de Neuchatel, CH-2000 Neuchatel (Switzerland)
3. National Research Institute for Metals, Tsukuba Laboratories, 1-2-1 Sengen, Tsukuba-Ibaraki 305 (Japan)
4. Institute for Materials Research, Tohoku University, Sendai 980 (Japan)
5. Institute of Industrial Science, The University of Tokyo, Roppongi, Minato-ku, Tokyo 106 (Japan)
6. Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278 (Japan)
7. Van Der Waals--Zeeman Laboratorium, Universiteit Amsterdam, 1018 XE Amsterdam (The Netherlands)

The results of low-temperature, ultrahigh-resolution ultraviolet photoemission studies of the electronic structure of stable icosahedral Al{sub 65}Cu{sub 20}Fe{sub 15}, Al{sub 64}Cu{sub 24}Fe{sub 12}, Al{sub 65}Cu{sub 20}Ru{sub 15}, Al{sub 65}Cu{sub 20}Ru{sub 7.5}Fe{sub 7.5}, Al{sub 65}Cu{sub 20}Os{sub 15}, Al{sub 70}Pd{sub 20}Mn{sub 10}, Al{sub 70}Pd{sub 20}Cr{sub 5}Fe{sub 5}, Al{sub 70.5}Pd{sub 21}Re{sub 8.5}, and Zn{sub 60}Mg{sub 32}Y{sub 8}, decagonal Al{sub 65}Co{sub 15}C{sub 20} and Al{sub 70}Co{sub 15}Ni{sub 15}, and crystalline Al{sub 7}Cu{sub 2}Ru and Ni{sub 2}MnAl alloys are presented. It is shown that these alloys have a clearly developed Fermi edge, and are thus metallic down to the temperature of measurement (12{endash}45 K). A marked decrease of the spectral intensity toward the Fermi level in quasicrystals is demonstrated to be consistent with the existence of the theoretically predicted pseudogap. With an experimental resolution of 5 meV, no evidence of the theoretically predicted spikiness of the density of states could be observed. A close similarity between the values and unusual dependencies of various physical parameters observed in quasicrystals and in their approximants suggests that they are not the consequence of the long-range quasiperiodicity, but rather result from a complex local atomic order. A review of the electronic properties of quasicrystals is also presented. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 561604
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 16 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALLOYS
ELECTRONIC STRUCTURE
ENERGY GAP
ENERGY-LEVEL DENSITY
FERMI LEVEL
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION