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

Benjamin A. Frandsen, Emil S. Bozin, Hefei Hu, Yimei Zhu, Yasumasa Nozaki, Hiroshi Kageyama, Yasutomo J. Uemura, Wei-Guo Yin and Simon J. L. Billinge ()
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Benjamin A. Frandsen: Columbia University
Emil S. Bozin: Brookhaven National Laboratory
Hefei Hu: Brookhaven National Laboratory
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

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6761

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