Evidence of an improper displacive phase transition in Cd${}_2$Re${}_2$O${}_7$ via time-resolved coherent phonon spectroscopy

Abstract

We have used a combination of ultrafast coherent phonon spectroscopy, ultrafast thermometry, and time-dependent Landau theory to study the inversion symmetry breaking phase transition at $T_c=200$ K in the strongly spin-orbit coupled correlated metal Cd${}_2$Re${}_2$O${}_7$. We establish that the structural distortion at $T_c$ is a secondary effect through the absence of any softening of its associated phonon mode, which supports a purely electronically driven mechanism. However, the phonon lifetime exhibits an anomalously strong temperature dependence that decreases linearly to zero near $T_c$. We show that this behavior naturally explains the spurious appearance of phonon softening in previous Raman spectroscopy experiments and should be a prevalent feature of correlated electron systems with linearly coupled order parameters.

arXiv comment5 pages main text, 5 figures, 7 pages supplementary information

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• Split Fermi Surfaces of the Spin-Orbit-Coupled Metal Cd2Re2O7 Probed by de Haas-van Alphen Effect
• First-principles studies of spin-orbital physics in pyrochlore oxides
• Low-Temperature Phase of the Cd${}_2$Re${}_2$O${}_7$ Superconductor: Ab initio Phonon Calculations and Raman Scattering
• Formation and Control of Twin Domains in the Pyrochlore Oxide Cd2Re2O7
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• Domain Control by Adjusting Anisotropic Stress in Pyrochlore Oxide Cd2Re2O7
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• Role of interlayer shear phonons on lattice symmetry switching in the transition metal dichalcogenide WTe${}_2$
• The Symmetry Principle in Condensed Matter Physics (I)