Photoemission study of an Al-Cu-Fe icosahedral phase

Mori, Masahiro; Matsuo, Shinji; Ishimasa, Tsutomu; Matsuura, Tamifusa; Kamiya, Kōji; Inokuchi, Hiroo; Matsukawa, T.

doi:10.1088/0953-8984/3/6/013

Cited by 95 publications

(45 citation statements)

References 7 publications

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“…E= Eq -ak2 for E< Eg Mori observed an anomalous valley at the Fermi level on AlCuFe samples, which is consistent with our results [Mori 1991]. Matsubara reported an observation of a gaplike feature in the inverse photoemission spectrum of the icosahedral phase of Al-Li-Cu, but a distinct gaplike feature was not recognized in the photoemission spectra [Matsubara 1991].…”

Section: Angle Resolved Photoemission Study On the Quasicrystal Alpdmnsupporting

confidence: 89%

“…Pseudogap and aperiodic dispersion relation was predicted in some theoretical models in favor of a Hume-Rothery explanation [Hafner 1992, Fujiwara 1991, Smith 1987, Carlsson 1993. Angle-integrated photoemission measurements on an AL-Cu-Fe icosahdral quasicrystal reveal a dip at Fermi level [Mori 1991]. A strong decrease of the DOS towards Fermi level is also reported on Al65Cu20Fei5 and Al70Pd20Mni0 quasicrystals [Stadnik 1993, Zhang 1994.…”

Section: Valence Induced Phase Transitionmentioning

confidence: 79%

“…This peak position of 4.24 eV is independent of the emission angle which suggests it is dispersionless. This peak is mainly due to the Pd 4d electrons by referring to Pd metal [Himpsel 1978] , Al70Pd20Mni0 [Zhang 1994],A1-Cu-Fe [Mori 1991]and Al-Li-Cu [Matsubara 1991] quasi-crystal photoemission data.…”

Section: Angle Resolved Photoemission Study On the Quasicrystal Alpdmnmentioning

confidence: 99%

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Photoemission study of some novel materials: rare earth/transition metal interface, Ba06K04BiO3 and AlPdMn

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the quali^ of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproductioaIn the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note wiU indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps. Each original is also photographed in one exposure and is included in reduced form at the back of the book.

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Section: Angle Resolved Photoemission Study On the Quasicrystal Alpdmnsupporting

confidence: 89%

Section: Valence Induced Phase Transitionmentioning

confidence: 79%

Section: Angle Resolved Photoemission Study On the Quasicrystal Alpdmnmentioning

confidence: 99%

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Photoemission study of some novel materials: rare earth/transition metal interface, Ba06K04BiO3 and AlPdMn

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“…There is an ongoing discussion about the surface electronic structure of quasicrystals. A particular issue is whether the surface density of states has a pseudogap at the Fermi level as is the case for the bulk density of states 5,6,7 and whether this pseudogap can affect chemical interactions with other materials, such as wetting. For this reason, we chose to study the interaction between a strong electron donor--the alkali metal potassium--and the quasicrystal surface, for which a low electron density is postulated.…”

Section: Introductionmentioning

confidence: 99%

TDS Study of Potassium Adsorption on Al(111) and fivefold Al-Pd-Mn

et al. 2000

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We have used thermal desorption spectroscopy to carry out a comparative study of potassium adsorption on Al(111) and on the fivefold Al-Pd-Mn surface. Potassium adsorption on the quasicrystal was found to be different than on Al(111). The potassium monolayer desorbed from fivefold Al-Pd-Mn at lower temperatures than from Al(111). Potassium is known to form a dense monolayer on Al(111), with an ideal coverage of 0.33, but for the monolayer on fivefold Al Pd Mn we find that the saturation coverage is only one twelfth. Disciplines Metallurgy CommentsThis article is from MRS Proceedings 643 (2000) ABSTRACTWe have used thermal desorption spectroscopy to carry out a comparative study of potassium adsorption on Al(111) and on the fivefold Al-Pd-Mn surface. Potassium adsorption on the quasicrystal was found to be different than on Al(111). The potassium monolayer desorbed from fivefold Al-Pd-Mn at lower temperatures than from Al(111). Potassium is known to form a dense monolayer on Al(111), with an ideal coverage of 0.33, but for the monolayer on fivefold Al Pd Mn we find that the saturation coverage is only one twelfth.

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“…7 The presence of a pseudogap has received strong experimental support during the last decade. 8,9 The physical origin of a spiky fine structure in the DOS may be related to the structural quasiperiodicity of the substrate via a hierarchical cluster aggregation resonance 10 or through d-orbital resonance effects. 11 These spiky features have remained quite elusive to experimental confirmation, 12 although some recent works support their possible physical existence.…”

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confidence: 99%

May quasicrystals be good thermoelectric materials?

Maciá

2000

Applied Physics Letters

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We present a theoretical analysis of quasicrystals ͑QCs͒ as potential thermoelectric materials. We consider a self-similar density of states model and extend the framework introduced in ͓G. D. Mahan and J. O. Sofo, Proc. Natl. Acad. Sci. U.S.A. 93, 7436 ͑1996͔͒ to systems exhibiting correlated features in their electronic structure. We show that relatively high values of the thermoelectric figure of merit, ranging from 0.01 up to 1.6 at room temperature, may be expected for these systems. We compare our results with available experimental data on transport properties of QCs and suggest some potential candidates for thermoelectric applications. © 2000 American Institute of Physics. ͓S0003-6951͑00͒03545-2͔During the last few years we have witnessed a growing interest in searching for high performance thermoelectric materials ͑TEMs͒. 1 The efficiency of thermoelectric devices depends on the transport coefficients of the constituent materials and it can be properly expressed in terms of the figure of merit ͑FOM͒ given by the dimensionless expression ϵZTϭ T S 2 /( e ϩ ph ) , where T is the temperature, is the electrical conductivity, S is the Seebeck coefficient and e and ph are the thermal conductivities due to the electrons and lattice phonons, respectively. The appealing question regarding what electronic structure provides the largest possible FOM was recently addressed by Mahan and Sofo 2 concluding that ͑i͒ the best TEM is likely to be found among materials exhibiting a sharp singularity ͑Dirac delta function͒ in the density of states ͑DOS͒ close to the Fermi level, and ͑ii͒, in that case, the effect of the DOS background contribution onto the FOM value may be quite dramatic: The FOM value being inversely proportional ͑in a marked nonlinear way͒ to the DOS value near the singularity.Quite interestingly the electronic structure of quasicrystalline alloys may satisfy these requirements in a natural way. In fact, thermodynamically stable quasicrystals ͑QCs͒ of high structural quality 3 exhibit unusual composition and temperature dependences of their transport coefficients, 4 which resemble more semiconductorlike than metallic character. 5 Theoretical efforts aimed to understand these anomalous transport phenomena have rendered two main results: ͑i͒ the existence of spiky features in the DOS near the Fermi level, 6 and ͑ii͒ the presence of a pronounced pseudogap at the Fermi level. 7

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Photoemission study of an Al-Cu-Fe icosahedral phase

Cited by 95 publications

References 7 publications

Photoemission study of some novel materials: rare earth/transition metal interface, Ba06K04BiO3 and AlPdMn

Photoemission study of some novel materials: rare earth/transition metal interface, Ba06K04BiO3 and AlPdMn

TDS Study of Potassium Adsorption on Al(111) and fivefold Al-Pd-Mn

May quasicrystals be good thermoelectric materials?

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