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@ARTICLE{Kotla:637354,
      author       = {Kotla, Surya Rohith and Noohinejad, Leila and Pokhriyal,
                      Preeti and Tolkiehn, Martin and AGARWAL, HARSHIT and
                      Ramakrishnan, Sitaram and van Smaalen, Sander},
      title        = {{B}roken inversion symmetry in the charge density wave
                      phase in {E}u{A}l$_4$},
      journal      = {Physical review / B},
      volume       = {112},
      number       = {6},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2025-03846},
      pages        = {064113},
      year         = {2025},
      abstract     = {EuAl$_4$ exhibits a complex phase diagram, including the
                      development of a charge density wave (CDW) below
                      $T_{\mathrm{CDW}}$ = 145K. Below $T_N$ = 15.4K, a series of
                      antiferromagnetically (AFM) ordered phases appear, while
                      nontrivial topological phases, like skyrmion lattices, are
                      stabilized under an applied magnetic field. The symmetries
                      of the variously ordered phases are a major issue concerning
                      the understanding of the stabilization of the ordered phases
                      as well as concerning the interplay between the various
                      types of order. EuAl$_4$ at room temperature has tetragonal
                      symmetry with space group I4/mmm. The CDW phase has an
                      incommensurately modulated crystal structure described by
                      the modulation wave vector q ≈ 0.17 c$^{∗}$. On the
                      basis of various experiments, including elastic and
                      inelastic x-ray scattering, and second-harmonic generation,
                      it has been proposed that the symmetry of the CDW phase of
                      EuAl$_4$ could be centrosymmetric orthorhombic,
                      noncentrosymmetric orthorhombic or noncentrosymmetric
                      tetragonal. Here, we report temperature-dependent,
                      single-crystal x-ray diffraction experiments that show that
                      the CDW is a transverse CDW with phason disorder, and with
                      noncentrosymmetric symmetry according to the orthorhombic
                      superspace group F222(0 0 σ )00s. Essential for this
                      finding is the availability of a sufficient number of
                      second-order (2q) satellite reflections in the x-ray
                      diffraction data set. The broken inversion symmetry implies
                      that skyrmions might form due to Dzyaloshinskii-Moriya (DM)
                      interactions, instead of a more exotic mechanism as it is
                      required for centrosymmetric structures.},
      cin          = {FS DOOR-User / FS-PET-D},
      ddc          = {530},
      cid          = {$I:(DE-H253)FS_DOOR-User-20241023$ /
                      I:(DE-H253)FS-PET-D-20190712},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20231047 (I-20231047) / DFG project
                      G:(GEPRIS)406658237 - Aperiodische Kristalle: Struktur,
                      Dynamik und elektronische Eigenschaften (406658237)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20231047 / G:(GEPRIS)406658237},
      experiment   = {EXP:(DE-H253)P-P24-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/kl2z-brms},
      url          = {https://bib-pubdb1.desy.de/record/637354},
}