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Topic Area: Condensed Matter Physics

Displaying records 71 to 80 of 106 records.
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71. Electronic Correlations and Satellites in Superconducting Oxides
Topic: Condensed Matter Physics
Published: 1/1/1988
Authors: K Chang, Marvin Cohen, David R. Penn
Abstract: The satellite observed at binding energy of 12-13 eV below the Fermi level in the high-T^dc^ oxide superconductors La^d2-x^Sr^dx^CuO^d4^ and YBa^d2^Cu^d3^O^d7-{delta}^ is viewed as originating from a state with two holes bound at the same Cu site. As ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620321

72. Free-electron-like Stoner Excitations in Fe
Topic: Condensed Matter Physics
Published: 1/1/1988
Authors: David R. Penn, S Apell
Abstract: An analysis of spin-polarized electron-energy-loss experiments in Fe is described which (1) identifies the contribution of d-electron Stoner excitations, the usual type of Stoner excitation, (2) suggests that free-electron-like Stoner excitations are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620322

73. Proposed Formula for Electron Inelastic Mean Free Paths Based on Calculations for 31 Materials
Topic: Condensed Matter Physics
Published: 12/1/1987
Authors: Shigeo Tanuma, Cedric John Powell, David R. Penn
Abstract: A new general formula is proposed for determining electron inelastic mean free paths (IMFP's) for 200-2000 eV electrons in solids. The new formula is based on separate IMFP calculations of 27 elements and 4 compounds using an algorithm due to Pen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620306

74. Evidence for Free Electron-Like Stoner Excitation in Fe
Topic: Condensed Matter Physics
Published: 1/1/1987
Author: David R. Penn
Abstract: An analysis of spin-polarized electron-energy-loss experiments in Fe is described which suggests that (1) free-electron-like Stoner excitations are far more probable than the usual type and (2) exchange events involving relatively large energy losses ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620285

75. Free Electron-Like Stoner Excitation in Fe
Topic: Condensed Matter Physics
Published: 1/1/1987
Author: David R. Penn
Abstract: Methods have recently developed to probe the Stoner excitation spectrum which has not been amenable to study by neutron diffraction. The experiments have utilized energy loss spectroscopy combined with spin polarization of the incident electron beam ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620275

76. Spin Polarized Secondary Electrons: Theory
Topic: Condensed Matter Physics
Published: 1/1/1986
Authors: David R. Penn, S Apell, S Girvin
Abstract: We show that the spin polarization of the secondary electrons, P(E), yields useful information about the electron-electron interaction. The ration of majority to minority spin lifetimes is related to the measured values of P(E) by {tau}^d{uarr}^(E)/ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620264

77. Citation Classic in Current Contents, 'Wave-Number-Dependent Dielectric Function of a Semiconductor'
Topic: Condensed Matter Physics
Published: 1/1/1985
Author: David R. Penn
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620241

78. Quantum Hall Effect: Role of Inversion Layer Geometry and Random Impurity Potential
Topic: Condensed Matter Physics
Published: 1/1/1984
Authors: R W Rendell, S Girvin
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620206

79. Optical Properties of Small Metal Spheres: Surface Effects
Topic: Condensed Matter Physics
Published: 4/25/1983
Authors: David R. Penn, S Apell
Abstract: It has been assumed that the optical properties of small spheres can be understood by means of a Drude dielectric function that incorporates a boundary scattering rate 1 / {tau}^ds^~=v^dF^ / R, where vF is the Fermi velocity and R is the sphere radiu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620233

80. Anomalous Electron Energy Loss in Small Spheres
Topic: Condensed Matter Physics
Published: 1/1/1983
Authors: David R. Penn, S Apell
Abstract: In analogy to the case of optical absorption, it is shown that inclusion of non-local surface effects results in a very large contribution to the energy loss of fast electrons scattered by a sphere. The scattering is found to be predominantly in the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620234



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