Critical behavior of semi-infinite magnets (invited)

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Abstract
The local critical behavior of magnets is modified in the vicinity of free surfaces. These surface effects can be studied by using semi-infinite model systems. Recent theoretical work on the semi-infinite n-vector model is reviewed. When possible the theoretical predictions are compared with experimental results. The general new features which show up in the field-theoretical renormalization-group approach are explained. Systems with defect planes and n-vector films are also briefly discussed.