s‒f exchange interactions and magnetic semiconductors

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Abstract
The title of these lectures reflects the intent more strongly than the content of them. For while we are particularly interested in how the s-f interaction appears differently in magnetic semiconductors than in metals, in which it has been studied extensively, it seemed necessary after the first lecture on the metals to develop the theory of magnetic semiconductors and their optical properties in greater detail before going on to treat the transport properties of these materials in which the s-f exchange interaction is very important. Thus, the greater portion of the lectures is on the whole theory of magnetic semiconductors and the s-f exchange is treated primarily at the beginning and end of the series.