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Full-Text Articles in Physics

Electronic Band Dispersion And Pseudogap In Quasicrystals: Angular-Resolved Photoemission Studies On Icosahedral Al70pd21.5mn8.5, X. Wu, Stefan Walenty Kycia, C. G. Olson, P. J. Benning, Alan I. Goldman, David W. Lynch Dec 1995

Electronic Band Dispersion And Pseudogap In Quasicrystals: Angular-Resolved Photoemission Studies On Icosahedral Al70pd21.5mn8.5, X. Wu, Stefan Walenty Kycia, C. G. Olson, P. J. Benning, Alan I. Goldman, David W. Lynch

Physics and Astronomy Publications

Angular-resolved photoelectron spectra from the fivefold surface of single-grain icosahedral Al70Pd21.5Mn8.5 exhibit a quasiperiodic dispersion of 300 meV at 2.3 eV binding energy. Low energy electron diffraction studies confirm quasicrystalline order at the surface. A distinct pseudogap feature is observed with a density of states near the Fermi level decreasing as a square-root power law.


Reply To ‘‘Comment On ‘Correlation Functions For Ionic Motion From Nmr Relaxation And Electrical Conductivity In The Glassy Fast-Ion Conductor (Li2s)0.56(Sis2)0.44’ ’’, Ivar Svare, Ferdinando Borsa, D. R. Torgeson, Steve W. Martin May 1995

Reply To ‘‘Comment On ‘Correlation Functions For Ionic Motion From Nmr Relaxation And Electrical Conductivity In The Glassy Fast-Ion Conductor (Li2s)0.56(Sis2)0.44’ ’’, Ivar Svare, Ferdinando Borsa, D. R. Torgeson, Steve W. Martin

Materials Science and Engineering Publications

Hunt’s Comment criticizes our recent article for combining concepts from percolation theory and effective-medium theories to calculate the dc and ac conductivities in ionic conducting glasses. Our approach was an attempt to describe the dc and ac conductivity with input information from our NMR measurements. We used the continuous-time random-walk theory and reasonable assumptions for the glasses which yielded good fits of the dc and ac conductivities at many temperatures.


New Metastable Nonmetallic Phase Of Europium, C. G. Olson, X. Wu, Z.-L. Chen, David W. Lynch Feb 1995

New Metastable Nonmetallic Phase Of Europium, C. G. Olson, X. Wu, Z.-L. Chen, David W. Lynch

Physics and Astronomy Publications

Metastable, close-packed films of elemental, divalent Eu from about a half to several monolayers thick on several substrates were found to be nonmetallic. Photoemission showed no states within 1.4 eV of the Fermi level. Low energy electron diffraction studies of Eu films on Ta(110) showed a closepacked pattern with orientational epitaxy. With increased thickness this phase reverted to metallic bcc Eu with orientational epitaxy.


Optical Properties Of Fe-Rh Alloys, Joo Yull Rhee, David W. Lynch Jan 1995

Optical Properties Of Fe-Rh Alloys, Joo Yull Rhee, David W. Lynch

Physics and Astronomy Publications

The dielectric functions (ε̃) of FexRh1−x alloys with x=0.48, 0.5, and 0.54 were measured by spectroscopic ellipsometry in the energy range 1.5–5.4 eV. The optical properties do not change drastically as the antiferromagnetic (AF)-ferromagnetic (F) phase transition occurs.