Metallic "Ferroelectricity" in the Pyrochlore Cd2Re2O7

Abstract

A class of materials known as ``ferroelectric metals'' was discussed theoretically by Anderson and Blount in 1965 [Phys. Rev. Lett. 14, 217 (1965)], but to date no examples of this class have been reported. Here we present measurements of the elastic moduli of Cd2Re2O7 through the 200 K cubic-to-tetragonal phase transition. A Landau analysis of the moduli reveals that the transition is consistent with Cd2Re2O7 being classified as a ``ferroelectric metal'' in the weaker sense described by Anderson and Blount (loss of a center of symmetry). First-principles calculations of the lattice instabilities indicate that the dominant lattice instability corresponds to a two-fold degenerate mode with Eu symmetry, and that motions of the O ions forming the O octahedra dominate the energetics of the transition.

4 pages, 2 figures

References in corpus (12)

• Superconductivity at 1 K in Cd2Re2O7
• Superconductivity in the Correlated Pyrochlore Cd_2Re_2O_7
• Low Temperature Symmetry of Pyrochlore Oxide Cd2Re2O7
• Electronic structure of the pyrochlore metals Cd2Os2O7 and Cd2Re2O7
• Magnetic and superconducting properties of Cd2Re2O7: Cd NMR and Re NQR
• Structural Ordering and Symmetry Breaking in Cd_2Re_2O_7
• Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7
• The second phase transition in the pyrochlore oxide Cd2Re2O7
• Fluctuation Effects on the Physical Properties of Cd2Re2O7 Near 200 K
• High-pressure study on the superconducting pyrochlore oxide Cd2Re2O7
• Optical evidence for mass enhancement of quasiparticles in pyrochlore Cd${}_2$Re${}_2$O${}_7$
• Temperature Dependence of the Magnetic Penetration Depth in the Vortex State of the Pyrochlore Superconductor, Cd2Re2O7

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