Abstract
New data on the specific heat, thermal expansion, and magnetization of the CaMn7O12 phase require a revision of the current concepts of the sequence of phase transitions in this compound. It is found that a spin-glass phase transition occurs in CaMn7O12 at T M = 49 K, whereas the transition at T S = 89 K exhibits the features of a first-order phase transition and thereby is apparently of structural origin. In the range T M < T< T S , the CaMn7O12 compound exhibits negative thermal expansion, which is also indicative of structural changes.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 82, No. 7, 2005, pp. 498–500.
Original Russian Text Copyright © 2005 by Volkova, Arango, Tristan, Kataev, Gudilin, Meier, Lorenz, Büchner, Vasil’ev.