Accession Number:

AD0271658

Title:

MAGNETIC PROPERTIES OF SPINS IN SOLIDS AT LOW CONCENTRATIONS

Descriptive Note:

Corporate Author:

BRANDEIS UNIV WALTHAM MASS

Personal Author(s):

Report Date:

1961-12-01

Pagination or Media Count:

1.0

Abstract:

A number of the properties of spins situated at lattice sites whose concentration relative to the total number of lattice sites is low are considered. The assumption of low concentration allows an expansion of the different spin properties in terms of concentration -- a series which is generally convergent at low concentrations. There may be an interaction between spin sites through lattice strain or coulomb interaction which will alter the random distribution. A suitable adjustment can be made for this possibility. The spins will be of one type and the site interaction will be defined by a suitable spin Hamiltonian. The interaction between spins will be dipolar, exchange etc. It will also be assumed the spins interact with the lattice by suitably defined spin lattice interactions. If each local spin has several energy levels, transitions between each level may be associated with a separate spin lattice relaxation time. The spins may be electronic or nuclear nuclear spins have the simplicity of being almost certainly randomly ituated if they differ by only being an isotope of the background type. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE