Phonon dispersions and Fermi surfaces nesting explaining the variety of charge ordering in titanium-oxypnictides superconductors

• Nakano, Kousuke

• Hongo, Kenta

• Maezono, Ryo

抄録

There has been a puzzle between experiments and theoretical predictions on the charge ordering of layered titanium-oxypnictides superconductors. Unconventional mechanisms to explain this discrepancy have been argued so far, even affecting the understanding of superconductivity on the compound. We provide a new theoretical prediction, by which the discrepancy itself is resolved without any complicated unconventional explanation. Phonon dispersions and changes of nesting vectors in Fermi surfaces are clarified to lead to the variety of superlattice structures even for the common crystal structures when without CDW, including orthorhombic 2 × 2 × 1 one for BaTi_2As_2O, which has not yet been explained successfully so far, being different from tetragonal √2× √2×1 for BaTi_2Sb_2O and BaTi_2Bi_2O. The electronic structure analysis can naturally explain experimental observations about CDW including most latest ones without any cramped unconventional mechanisms.

identifier:https://dspace.jaist.ac.jp/dspace/handle/10119/15357

収録刊行物

• Scientific Reports

  Scientific Reports 6 Article number: 29661-, 2016-07-19

  Springer Nature

キーワード

• Layered Titanium-Oxynictides
• Phonon softening
• Superstructures

詳細情報

• CRID: 1050845762468679808
• NII論文ID: 120006490000
• ISSN: 20452322
• DOI: 10.1038/srep29661
• Web Site: http://hdl.handle.net/10119/15357
• Web Site: https://www.nature.com/articles/srep29661
• Web Site: https://www.nature.com/articles/srep29661.pdf
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN