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Physics

Condensed matter

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Displaying 1151 - 1175 of 1253

Resonant satellites in photoemission and Auger spectra of d-band metals

March 1, 1981
Author(s)
S Girvin, David R. Penn
Photoemission and Auger electron spectroscopy are powerful tools in the study of the electronic and magnetic properties of d band metals. In certain instances experimental spectra can be directly interpreted as a measure of some one body density of states

Polarized Low Energy Electron Diffraction (PLEED) from W(100)

February 15, 1981
Author(s)
G Wang, Robert Celotta, Daniel T. Pierce
A set of polarized low-energy-electon diffraction (PLEED) data from a W(100) surface measured using a polairzed electron beam is presented. The data include conventional LEED profilesI(E,θ) as well as S(Eθ profiles which measure the spin dependence of the

New Field Theory Formulation of Localized States in Disordered Systems

January 1, 1981
Author(s)
S Girvin, R W. Rendell, Garnett W. Bryant
We present a new field theoretic formulation of the quantum mechanics of disordered systems. The problem is converted to an explicit field theory by changing variables in the functional integral over all random potentials to an integral over all possible

Spin Dependence of Electronic Surface Resonance Scattering from W(100)

January 1, 1981
Author(s)
Daniel T. Pierce, Robert Celotta, G Wang, E McRae
In polarized low energy electron diffraction (PLEED) from W(100) at energies of 2 to 9 eV and incident angles 15 degrees < θ < 45 degrees, we observe a spin-splitting of the resonance sequence of peaks which converge on the (01) beam threshold. For θ > 26

Spin Dependence of the Electron Mean Free Path in Fe, Co, and Ni

December 22, 1980
Author(s)
R W. Rendell, David R. Penn
Spin-dependent electron mean free paths as a function of the hot electron energy are calculated for Fe, Co, and Ni. The difference in mean free paths of electrons for spin parallel and antiparallel to the majority spin direction of the ferromagnet is found

Ising Models for Order-Disorder Transition in an Adsorbed Overlayer

March 2, 1980
Author(s)
T M. Lu
Based on a 2D zero field anti-ferromagnetic Ising model, we obtain a relation between the angular distribution of intensity of a LEED superlattice beam from an adsorbed lattice gas with nearest-neighbor repulsive interaction and the spin-spin correlation

Ultraviolet Photoemission Spectroscopy of Pd-Si Glasses

February 1, 1980
Author(s)
B Waclawski, D S. Boudreaux
In order to determine systematic changes in the density of states with alloy composition, photoelectron spectra at hv=21.2 eV were measured for several amorphous alloys based on the well-known Pd-Si glass system. Three binary alloys with 15, 20, and 25 at

A Polarized LEED Study of Surface Magnetism

January 1, 1980
Author(s)
Daniel T. Pierce, Robert Celotta, G Wang, G P. Felcher, S Bader, K Miyano
The surface magnetization of ferromagnetic Ni(110) has been observed via the use of a spin polarized electron beam. The spin dependence of the scattered electron intensity was measured as a function of external magnetic field strength and temperature.

Bound Hole Pairs in Ni: Evidence from Photoemissions

November 1, 1979
Author(s)
David R. Penn
I show that the Ni d-band density of states contains a peak due to excitations of bound hole pairs. The density of states is observed directly in photoemission experiments which show a satellite peak below the bottom of the d bands.

Spin and Energy Analyzed Photoemission: A Feasibility Analysis

November 1, 1979
Author(s)
Daniel T. Pierce, C Kuyatt, Robert Celotta
New scientific opportunities, particularly for investigation of surface magnetism, will be provided by spin and energy analyzed photoemission. Electron-optical conservation laws and phase space concepts are summarized and applied to determine the

Surface Magnetization of Ferromagnetic Ni(110): A Polarized LEED Experiment

September 3, 1979
Author(s)
Robert Celotta, Daniel T. Pierce, G Wang, S Bader, G P. Felcher
The magnetic field dependence (hysteresis curve) and the temperature dependence of the magnetization at a Ni(110) surface was measured by polarized low-energy electron diffraction. The diffracted intensities are spin dependent by a few percent. The

Symmetry in Low-Energy-Polarized-Electron Diffraction

May 14, 1979
Author(s)
G Wang, B Dunlap, Robert Celotta, Daniel T. Pierce
The first low-energy-electron diffraction measurements using a polarized incident electron beam are reported and compared to measurements where an unpolarized incident beam is analyzed after scattering. Whereas, because of multiple scattering, equivalence

Effect of Bound Hole Pairs on the d-Band Photoemission Spectrum of Ni

April 2, 1979
Author(s)
David R. Penn
It is shown that the spectral density of the Ni d electrons contains a peak due to excitations of bound hole pairs. The spectral density is observed directly in photoemission experiments which show a satellite peak below the bottom of the d bands. The

UV Photoemission for Rare Gases Implanted in Ge

August 21, 1978
Author(s)
B Waclawski, John William Gadzuk, J F. Herbst
The first ultraviolet photoemission spectra of the valence electrons of rare-gas atoms, implanted by ion bombardment into an amorphous Ge matrix, are presented here. The positions of the peaks in the observed spectra are shifted relative to gas-phase
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