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Topic Area: Condensed Matter Physics
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Displaying records 71 to 80 of 111 records.
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71. Limitations on a Combined Phonon -- Non-Phonon Mechanism for Superconductivity Bi^d2^Sr^d3^Ca^d1^Cu^d2^O^dx^
Topic: Condensed Matter Physics
Published: 1/1/1991
Authors: I Barbee, Marvin Cohen, David R. Penn
Abstract: ^d^^d^^d^^d^^d^ Despite the large number of theories proposed to explain high-temperature superconductivity, no clear explanation of its origin exists. Experimental data such as the isotope effect {alpha} and the gap ratio 2{Delta}/k^db^T^dc^ can be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620401

72. Extended Transfer Hamiltonian Method for Resonant Tunneling
Topic: Condensed Matter Physics
Published: 12/10/1990
Authors: S Apell, E Albertsson, David R. Penn
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620364

73. Limitations on Electronic Mechanisms for High Temperature Superconducting Oxides
Topic: Condensed Matter Physics
Published: 1/1/1990
Authors: David R. Penn, Marvin Cohen, I Barbee
Abstract: The effects of electronic mechanisms for electron pairing in high temperature superconducting oxides on both the transition temperature T^dc^ and the isotope effect parameter {alpha} are considered. It is shown that for the higher T^dc^ oxides, meas ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620382

74. Weak versus Strong Coupling Theory for Bi^d2^Sr^d2^CaCu^d2^O^d8^
Topic: Condensed Matter Physics
Published: 1/1/1990
Authors: Marvin Cohen, David R. Penn
Abstract: ^d^^d^^d^^d^ The latest optical determination of the superconducting-gap function for Bi^d2^Sr^d2^CaCu^d2^O^d8^ is consistent with weak-coupling theory. In contrast, a large discontinuity in heat-capacity data suggests strong-coupling superconductivi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620366

75. Total Dielectric Function: Algebraic Sign, Electron-Lattice Response, and Superconductivity
Topic: Condensed Matter Physics
Published: 8/1/1988
Authors: P Allen, Marvin Cohen, David R. Penn
Abstract: The interaction between two test charges in a solid can be described in terms of a total dielectric function that includes electronic and lattice polarization. Crystal stability requires the eigenvalues of {epsilon}^u-1^ to be <= 1. Some implicati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620307

76. 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

77. 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

78. 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

79. 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

80. 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



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