Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-08-20
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.92.105702
The temperature and pressure dependence of the thermal displacements and lattice parameters were obtained across the $\gamma \to \alpha$ phase transition of Ce using high-pressure, high-resolution neutron and synchrotron x-ray powder diffraction. The estimated vibrational entropy change per atom in the $\gamma \to \alpha$ phase transition, $\Delta S^{\gamma - \alpha}_{\rm vib} \approx (0.75 \pm 0.15)$k$_{\rm B}$, is about half of the total entropy change. The bulk modulus follows a power-law pressure dependence which is well described using the framework of electron-phonon coupling. These results clearly demonstrate the importance of lattice vibrations, in addition to the spin and charge degrees of freedom, for a complete description of the $\gamma \to \alpha$ phase transition in elemental Ce.
Darling T. W.
Graf Matthias. J.
Heffner Robert H.
Jeong Il-Kyoung
Jorgensen J. D.
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