Electronic Structure of Icosahedral Alloys Studied by Ultrahigh Energy Resolution Photoemission Spectroscopy

Stadnik, Z. M.; Purdie, D.; Garnier, M. G.; Baer, Y.; Tsai, An‐Pang; Inoue, Akihisa; Edagawa, Keiichi; Takeuchi, Shin

doi:10.1103/physrevlett.77.1777

Cited by 83 publications

(70 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…31,32 The physical origin of such peaks may stem from the structural quasiperiodicity of the substrate via a hierarchical cluster aggregation resonance 33 or through d-orbital resonance effects. 34 These spiky features have remained quite elusive to experimental confirmation, [35][36][37][38] although some recent works provide some support to their possible physical existence. 39,40 Thus, although the presence of a dense set of spiky features in the DOS might have a profound effect on the transport properties of QC's, significantly contributing to explain some unusual behaviors in both the electrical conductivity 41 and the thermopower in terms of band structure effects, 42 at the time being the question about their very physical existence is far from being definitively settled.…”

Section: Electronic Structure Modelmentioning

confidence: 99%

Theoretical prospective of quasicrystals as thermoelectric materials

Maciá

2001

Phys. Rev. B

View full text Add to dashboard Cite

In this work we present a theoretical study on the possible use of quasicrystals as potential thermoelectric materials. By considering a suitable model for the spectral conductivity we show that high values of the thermoelectric figure of merit, beyond the practical upper limit ZTϭ1, may be expected for certain quasicrystalline alloys. We also study their performance at different working temperature ranges, favoring low temperature thermoelectric applications for these materials. By comparing our analytical results with available experimental data on the transport coefficients of different quasicrystalline families, we suggest the icosahedral Cd-Yb and the dodecagonal Ta-Te binary phases as two promising candidates for further research.

show abstract

Section: Electronic Structure Modelmentioning

confidence: 99%

Theoretical prospective of quasicrystals as thermoelectric materials

Maciá

2001

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The physical origin of such peaks may stem from the structural quasiperiodicity of the substrate via a hierarchical cluster aggregation resonance 56 or through d-orbital resonance effects. 85,86 This spiky component is still awaiting a definitive experimental confirmation, [87][88][89][90][91] although recent tunneling spectroscopy measurements provide experimental support for the existence of some fine structure, asymmetrically placed with respect to the Fermi level. 92 In order to make a meaningful comparison with experimental measurements one should take into account possible phason, finite lifetime, and temperature broadening effects.…”

Section: Electronic Structure Modelmentioning

confidence: 99%

Universal features in the electrical conductivity of icosahedral Al-transition-metal quasicrystals

Maciá

2002

Phys. Rev. B

View full text Add to dashboard Cite

In this work we report the existence of certain universal features in the temperature dependence of the electrical conductivity of Al-transition-metal icosahedral quasicrystals, extending the results previously reported on the inverse Matthiessen rule ͓D. Mayou, C. Berger, F. Cyrot-Lackmann, T. Klein, and P. Lanco, Phys. Rev. Lett. 70, 3915 ͑1993͔͒. We propose a tentative classification scheme providing a unified description of the electrical conductivity curves over a broad temperature range. We introduce a phenomenological model describing the electrical conductivity of icosahedral quasicrystals, deriving closed analytical expressions. We compare our analytical results with suitable experimental data and illustrate the use of the introduced phenomenological coefficient in order to extract information about the electronic structure of the samples from a fitting analysis of the experimental conductivity curves.

show abstract

“…For a detailed understanding of the electronic structure, photoelectron spectroscopy has developed into an extremely useful tool 5,6 , and thus has also been applied to quasicrystalline materials in recent years; an overview of work performed until 1998 is given by Stadnik (see reference 4 and references therein). Issues addressed in recent studies have been the evidence for the existence of a pseudogap [7][8][9] , the assignment of features in the valence level spectrum to the different constituent atoms 10 from cross-section considerations and resonant photoemission, and the evidence for dispersing states in the valence level spectrum 11,12 . Attention has also been paid to the variations in relative intensities in the valence level region, and the intensities and line shapes of core level emission 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Core and valence level photoemission and photoabsorption study of icosahedral Al–Pd–Mn quasicrystals

Horn¹,

Theis²,

Paggel³

et al. 2005

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The electronic structure of quasicrystalline Al-Pd-Mn is investigated by means of valence and core level photoelectron spectroscopy. Variations of the photoionization cross section in the constituents' valence electronic levels as a function of photon energy are used to identify contributions from the different atomic species, in particular near the Pd 4d Cooper minimum.Resonant photoemission at the Mn 2p absorption edge shows the contribution of the Mn 3d states to the density of states in a region near the Fermi level. The asymmetry of Pd 3d and Mn 2p core level photoemission lines, and its difference for emission from metallic and quasicrystalline phases is utilized to infer the contributions of the different constituents to the density of states at the Fermi level.

show abstract

Electronic Structure of Icosahedral Alloys Studied by Ultrahigh Energy Resolution Photoemission Spectroscopy

Cited by 83 publications

References 24 publications

Theoretical prospective of quasicrystals as thermoelectric materials

Theoretical prospective of quasicrystals as thermoelectric materials

Universal features in the electrical conductivity of icosahedral Al-transition-metal quasicrystals

Core and valence level photoemission and photoabsorption study of icosahedral Al–Pd–Mn quasicrystals

Contact Info

Product

Resources

About