On the nature of the γ-α transition in cerium |
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Authors: | G Eliashberg H Capellmann |
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Institution: | (1) Institut für Theoretische Physik, RWTH Aachen, D-52056 Aachen, Germany;(2) Landau Institute of Theoretical Physics, 142432 Chernogolovka, Russia |
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Abstract: | In 1964 Davis and Adams established that the large increase of the thermal expansion and compressibility in the critical region
of the γ-to α-Ce phase transition occurs predominantly in the α phase. This provides strong evidence that a tricritical point
is realized in Ce. This also means that the aforementioned transition is not isomorphic and that α-Ce should have a distorted
fcc structure. A careful examination of Jayaraman’s data (1965) shows that a second-order transition line continues beyond
the tricritical point to the vicinity of a triple point on the melting curve. The phase boundary with the tricritical point
and the minimum of the melting curve are reconstructed within the framework of Landau theory.
Pis’ma Zh. éksp. Teor. Fiz. 67, No. 2, 111–117 (25 January 1998)
Published in English in the original Russian journal. Edited by Steve Torstveit. |
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