Part I. Numerical investigation of the RKKY interaction in a BCS superconductor. Part II. Dynamical analysis of LEED from the (110) surfaces of substitutionally disordered Ga/sub x/Al/sub 1-x/As
In Part I the spatial spin susceptibility chi(r) of a BCS superconductor is calculated using finite temperature Green's functions. A numerical study of the results reveals that the RKKY interaction is only modified by about 2-3% from its normal value for distances less than 10 p/sub o//sup -1/ where p/sub o/ is the Fermi momentum, and that the change in the RKKY interaction is exponentially damped out at further distances. Part II discusses the extention of low-energy electron diffraction (LEED), which as been successful in determining the surface atomic geometries of compound semiconductors, to surface structure studies of substitutionally disordered ternary semiconductor interfaces. An average T-matrix approximation (ATA) is used to compute the intensities of 30 - 240 eV low-energy electrons diffracted from the (110) surfaces of Ga/sub x/Al/sub 1-x/As(110), for values of x = 0.00, 0.25, 0.32, 0.50, 1.00. Computed diffracted intensities correctly mimic the trends in the experimental data and attempt a structure search for Ga/sub 0.50/Al/sub 0.50/As.
- Research Organization:
- Ohio State Univ., Columbus (USA)
- OSTI ID:
- 6362480
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
GALLIUM ARSENIDES
ELECTRONIC STRUCTURE
SUPERCONDUCTORS
INTERACTIONS
MAGNETIC SUSCEPTIBILITY
ALUMINIUM COMPOUNDS
BCS THEORY
ELECTRON DIFFRACTION
GREEN FUNCTION
SPIN
SURFACE PROPERTIES
THEORETICAL DATA
ANGULAR MOMENTUM
ARSENIC COMPOUNDS
ARSENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
FUNCTIONS
GALLIUM COMPOUNDS
INFORMATION
MAGNETIC PROPERTIES
NUMERICAL DATA
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
PNICTIDES
SCATTERING
360603* - Materials- Properties
656102 - Solid State Physics- Superconductivity- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena- (-1987)