TABULATION OF FIRST ORDER MAGNETIC PHASE TRANSITIONS.
Scientific rept. no. 3,
MITHRAS INC CAMBRIDGE MASS
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A literature search has been carried out and a tabulation has been made of all known first order magnetic phase transitions. The table includes all substances which have been found to undergo such phase transitions, and their relevant characteristics have been studied. The search has been conducted up to July 1963. One kind of transition the so-called spin-flopping type exists for a very large class of materials. Since it can be characterized analytically in terms of other parameters of these materials, it was felt preferable to give a discussion of this transition, rather than an exhaustive literatue search. In order to properly guide the nature of the search, a definition of first order magnetic phase transitions is formulated in terms of familiar thermodynamic quantities. Sone of the implications of this definition are discussed. An example of a first order magnetic phase transition is discussed AF - AF spin flop, and characterized by three parameters anistropy energy, and parallel and perpendicular susceptibilities. Author