DOE OSTI ยท 3377018
Evolution of charge density wave soft phonon modes in Pd ๐ฅ โขErTe 3
Abstract
Here, we investigated the lattice dynamics of quasi-two-dimensional Pd-intercalated ErTe 3 in relation to its charge-density-wave (CDW) transitions by means of x-ray diffuse and meV-resolution inelastic x-ray scattering. In pristine ErTe 3 , CDW order develops at orthogonal in-plane wave vectors q$^๐_1$ =(0,0,0.29) (the ๐โCDW ) and q$^๐_2 $= (0.31,0,0) (the ๐โCDW ), with transition temperatures $๐^๐_1$ = 270K and $๐^๐_2$ = 160K, respectively. Remarkably, we observe diffuse x-ray scattering already near the higher transition temperature $๐^๐_1$ along ๐โCDW but at a slightly different wave vector q$^๐_1$ = (0.29,0,0). Inelastic x-ray scattering for Pd 0.01 โขErTe 3 shows that a partial phonon softening at q$^๐_1$, underscoring the strong competition between ordering tendencies along the nearly equivalent in-plane axes of the orthorhombic lattice. For intercalation levels ๐ฅ โฅ 0.02, the ๐โCDW state is suppressed. Nevertheless, a similar correlation between phonon softening and diffuse scattering persists along the [100] direction, again observed at q$^๐_1$ = (0.29,0,0) and $๐^๐_1$. These findings suggest that the ๐โCDW is fully suppressed for ๐ฅ โฅ 0.02, and that the residual diffuse scattering at originates from the partial phonon softening associated with the ๐โCDW, reflected by the near equality of the absolute size of q$^๐_1$ and q$^๐_1$.
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Maity, Avishek [Technische Univ. Mรผnchen, Garching (Germany); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000324297948), Rosenkranz, Stephan [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:0000000256590383), Osborn, Raymond [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:0000000195653140), Heid, Rolf [Karlsruhe Institute of Technology (KIT) (Germany)] (ORCID:0000000221441417), Said, Ayman H. [Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)], Alatas, Ahmet [Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)] (ORCID:000000016521856X), Straquadine, Joshua A. W. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)] (ORCID:0000000165309541), Krogstad, Matthew J. [Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)] (ORCID:0000000285055945), Singh, Anisha G. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)] (ORCID:0000000348819384), Fisher, Ian R. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)] (ORCID:0000000212787862), Weber, Frank [Karlsruhe Institute of Technology (KIT) (Germany)] (ORCID:0000000242561354). 2026-06-01. Evolution of charge density wave soft phonon modes in Pd ๐ฅ โขErTe 3. https://doi.org/10.1103/7ky1-nmyx
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