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Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors

Author

Listed:
  • Benjamin A. Frandsen

    (Columbia University)

  • Emil S. Bozin

    (Brookhaven National Laboratory)

  • Hefei Hu

    (Brookhaven National Laboratory
    Present address: Intel Corporation, Folsom, California 95630, USA)

  • Yimei Zhu

    (Brookhaven National Laboratory)

  • Yasumasa Nozaki

    (Graduate School of Engineering, Kyoto University)

  • Hiroshi Kageyama

    (Graduate School of Engineering, Kyoto University)

  • Yasutomo J. Uemura

    (Columbia University)

  • Wei-Guo Yin

    (Brookhaven National Laboratory)

  • Simon J. L. Billinge

    (Brookhaven National Laboratory
    Columbia University)

Abstract

Understanding the role played by broken-symmetry states such as charge, spin and orbital orders in the mechanism of emergent properties, such as high-temperature superconductivity, is a major current topic in materials research. That the order may be within one unit cell, such as nematic, was only recently considered theoretically, but its observation in the iron-pnictide and doped cuprate superconductors places it at the forefront of current research. Here, we show that the recently discovered BaTi2Sb2O superconductor and its parent compound BaTi2As2O form a symmetry-breaking nematic ground state that can be naturally explained as an intra-unit-cell nematic charge order with d-wave symmetry, pointing to the ubiquity of the phenomenon. These findings, together with the key structural features in these materials being intermediate between the cuprate and iron-pnictide high-temperature superconducting materials, render the titanium oxypnictides an important new material system to understand the nature of nematic order and its relationship to superconductivity.

Suggested Citation

  • Benjamin A. Frandsen & Emil S. Bozin & Hefei Hu & Yimei Zhu & Yasumasa Nozaki & Hiroshi Kageyama & Yasutomo J. Uemura & Wei-Guo Yin & Simon J. L. Billinge, 2014. "Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6761
    DOI: 10.1038/ncomms6761
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