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First-order phase transition in the graphite compound LiC₆

Authors:	J. Rossat-Mignod A. Wiedenmann K.C. Woo J.W. Milliken J.E. Fischer

Affiliation:	Laboratoire de Diffraction Neutronique, Department de Recherche Fondamentale, Centre d''Etudes Nucleaires, 85X, F-38 041 Grenoble, France;Moore School of Electrical Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104, U.S.A.

Abstract:	Elastic neutron scattering and scanning calorimetry reveal a weakly first-order “melting” of the Li layers in the graphite intercalation compound LiC₆ at T₀ = 715.4 K, in excellent agreement with recent experiment with recent experiments by Robinson and Salamon. The first-order nature of the transition also agrees with a prediction by Bak and Domany derived from Landau expansions, but the detailed behavior of the fluctuation-induced power-law precursor differs from recent Monte Carlo simulations of the 3D?3q Potts model.

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