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Topic Area: Condensed Matter Physics

Displaying records 61 to 70 of 111 records.
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61. Interpretation of Resonant Photoemission Spectra of Solid Actinide Systems
Topic: Condensed Matter Physics
Published: 6/15/2001
Authors: S Molodtsov, S Halilov, M Richter, A Zangwill, C Laubschat
Abstract: It is shown that angle-resolved valence-band photoemission (PE) spectra of epitaxial close-packed films of U metal may correctly be described within a one-step model of PE based on a band description of the U 5f states. It is found that a cross-secti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620535

62. Cooper Minima in the Photoemission Spectra of Solids
Topic: Condensed Matter Physics
Published: 11/6/2000
Authors: S Molodtsov, S Halilov, V Servedio, W Schneider, S Danzenbaecher, J Hinarejos, M Richter, C Laubschat
Abstract: Variations of the photoionization cross-section of valence states as a function of interatomic distance are studied by means of atomic and solid-state density functional approaches and compared with photoemission data. In contrast to the free atom c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620532

63. Dynamical Screening at the Metal-semiconductor Interface and Excitonic Superconductivity
Topic: Condensed Matter Physics
Published: 3/27/1997
Authors: Oleg Zakharov, Marvin Cohen, Steven G Louie, David R. Penn
Abstract: We examine the possibility of excitonic superconductivity at a metal-semiconductor interface. An ab initio RPA calculation of the screened Coulomb electron-electron interaction is performed for the silicon-jellium multilayer model. The superconductin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620486

64. Generalized Slater-Koster Method for Fitting Band Structures
Topic: Condensed Matter Physics
Published: 1/1/1997
Author: Mark D Stiles
Abstract: A tight-binding procedure is presented for fitting electronic band structures of crystals. It is based on a fully automated method of determining all possible independent matrix elements for arbitrary crystal structures. A fit, using this method, f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620475

65. Total-dielectric-function Approach to Electron and Phonon Response in Solids
Topic: Condensed Matter Physics
Published: 1/1/1995
Authors: David R. Penn, S Lewis, Marvin Cohen
Abstract: The interaction between two test charges, the response of a solid to an external field, and the normal modes of the solid can be determined from a total dielectric function that includes both electronic and lattice polarizabilities as well as local- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620441

66. Inverse Isotope Effects and Models for High-Tc Superconductivity
Topic: Condensed Matter Physics
Published: 1/1/1993
Authors: David R. Penn, Marvin Cohen, V Crespi
Abstract: A model for high-temperature superconductivity with a mass-independent electronic mechanism in conjunction with a moderate amount of electron-phonon coupling has previously been shown to be inconsistent with experimental constraints on T^dc^, the iso ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620413

67. Effects of Broadening on the BCS Theory in the Presence of Van Hove Singularities
Topic: Condensed Matter Physics
Published: 1/1/1992
Authors: David R. Penn, Marvin Cohen
Abstract: There have been recent suggestions that high-Tc superconductivity can be understood in terms of conventional BCS theory if there is a logarithmic Van Hove singularity in the electron density of states near the Fermi energy as suggested by band theory ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620408

68. Photo-Induced Resonant Tunneling Treated by the Extended Transfer Hamiltonian Method
Topic: Condensed Matter Physics
Published: 1/1/1992
Authors: S Apell, David R. Penn
Abstract: A method, originally due to Heitler, is utilized to extend the transfer Hamiltonian description to resonant tunneling for the purpose of calculating transition probabilities and general frequency response characteristics of coupled systems. The scann ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620402

69. Anharmonic Phonons and the Isotope Effect in Superconductivity
Topic: Condensed Matter Physics
Published: 1/1/1991
Authors: V Crespi, Marvin Cohen, David R. Penn
Abstract: Anharmonic interionic potentials are examined in an Einstein model to study the unusual isotope-effect exponents for the high-T(c) oxides. The mass dependences of the electron-phonon coupling constant {lambda} and the average phonon frequency square- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620376

70. Experimental Constraints on Some Mechanisms for High-Temperature Superconductivity
Topic: Condensed Matter Physics
Published: 1/1/1991
Authors: I Barbee, Marvin Cohen, David R. Penn
Abstract: Since its discovery, many mechanisms have been suggested to explain the phenomenon of high-temperature superconductivity in oxides. We propose that experimental data, along with theoretical models, can place constraints on or exclude many of these me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620389



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