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@ARTICLE{Lacmann:601061,
      author       = {Lacmann, Tom Laurin and Haghighirad, Amir-Abbas and
                      Souliou, Sofia Michaela and Merz, Michael and Garbarino,
                      Gaston and Glazyrin, Konstantin and Heid, Rolf and Le Tacon,
                      Matthieu},
      title        = {{H}igh-pressure phase diagram of {B}a{N}i$_2${A}s$_2$:
                      {U}nconventional charge density waves and structural phase
                      transitions},
      journal      = {Physical review / B},
      volume       = {108},
      number       = {22},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2024-00088},
      pages        = {224115},
      year         = {2023},
      abstract     = {Structural phase transitions accompanied by incommensurate
                      and commensurate charge density wave (CDW) modulations of
                      unconventional nature have been reported in BaNi$_2$As$_2$,
                      a nonmagnetic cousin of the parent compound of Fe-based
                      superconductors, BaFe$_2$As$_2$. The strong dependence of
                      the structural and CDW transitions of BaNi$_2$As$_2$ on
                      isoelectronic substitutions alongside original dynamical
                      lattice effects suggests strong tunability of the electronic
                      phase of the system through structural effects. Here, we
                      present a comprehensive synchrotron x-ray diffraction and
                      first-principles calculation study of the evolution of the
                      crystal structure and lattice instabilities of
                      BaNi$_2$As$_2$ as a function of temperature and hydrostatic
                      pressure (up to 12 GPa). We report a cascade of
                      pressure-induced structural phase transitions and electronic
                      instabilities up to ≈10 GPa, above which all CDW
                      superstructures disappear. We reveal that the stable
                      high-pressure phase consists of planar Ni zigzag chains,
                      from which the surrounding As atoms have been pushed away.
                      This yields a strong reduction of the interlayer As-As
                      distance (along the original c axis), akin to what is
                      observed in the collapsed tetragonal structure of other
                      pnictides, albeit here with a monoclinic structure. The
                      discovery of polymorphs in the pressure-temperature phase
                      diagram of BaNi$_2$As$_2$ emphasizes the importance of the
                      relative Ni-Ni and Ni-As bond lengths in controlling the
                      electronic ground state of this compound and increases our
                      understanding of viable electronic phases under extreme
                      conditions.},
      cin          = {DOOR ; HAS-User / FS-PET-D},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PET-D-20190712},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20200263 (I-20200263) / DFG project 441231589
                      - Wechselspiel zwischen Ladungsordnung und magnetischer
                      Ordnung in Seltenen-Erd-Nickeldicarbiden. (441231589) / DFG
                      project 444821420 - Elastische Kontrolle von konkurrierenden
                      Ordnungen in korrelierten Supraleitern (B03) (444821420)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20200263 / G:(GEPRIS)441231589 /
                      G:(GEPRIS)444821420},
      experiment   = {EXP:(DE-H253)P-P02.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001141819100002},
      doi          = {10.1103/PhysRevB.108.224115},
      url          = {https://bib-pubdb1.desy.de/record/601061},
}