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No role for phonon entropy in the fcc -> fcc volume collapse transition in Ce0.9Th0.1 at ambient pressure

Manley, M. E. and McQueeney, R. J. and Fultz, B. and Swan-Wood, T. and Delaire, O. and Goremychkin, E. A. and Cooley, J. C. and Hults, W. L. and Lashley, J. C. and Osborn, R. and Smith, J. L. (2003) No role for phonon entropy in the fcc -> fcc volume collapse transition in Ce0.9Th0.1 at ambient pressure. Physical Review B, 67 (1). Art. no. 014103. ISSN 1098-0121.

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Phonon densities of states (DOS) were obtained from inelastic neutron scattering measurements on Ce0.9Th0.1 at temperatures from 10 to 300 K. The alpha phase showed a significant softening of its phonon DOS when heated from 10 to 140 K. Despite the 17% volume collapse, the phonon DOS showed little change between the gamma phase at 150 K and the alpha phase at 140 K. This is supported by analysis of the magnetic spectra showing that most of the transition entropy can be accounted for with the crystal field and changes in the ground-state spin fluctuations. We argue that the anomalous behavior of the phonon DOS originates with the volume dependence of the ground-state spin fluctuations.

Item Type:Article
Additional Information:©2003 The American Physical Society. Received 7 October 2002; published 16 January 2003. We thank A. C. Lawson and C. M. Varma for helpful discussions. This work was supported by the U.S. Department of Energy under Contracts No. DE-FG03-96ER45572 and No. W-31-109-ENG-38.
Subject Keywords:cerium alloys; thorium alloys; phonons; solid-state phase transformations; ground states; spin fluctuations; neutron diffraction; phonon-phonon interactions; equations of state
Record Number:CaltechAUTHORS:MANprb03
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2002
Deposited By: Tony Diaz
Deposited On:01 Mar 2006
Last Modified:26 Dec 2012 08:47

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