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

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 (HTSC) 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 BaTi${}_2$Sb${}_2$O superconductor and its "parent" compound BaTi${}_2$As${}_2$O form a symmetry-breaking nematic ground state that can be naturally explained as an intra-unit-cell 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 HTSC materials, render the titanium oxypnictides an important new material system to understand the nature of nematic order and its relationship to superconductivity.

arXiv comment7 pages, 5 figures

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• Weak metal-metal transition in the vanadium oxytelluride Rb${}_{1-\delta }$V${}_2$Te${}_2$O
• Phonon dispersions and Fermi surfaces nesting explaining the variety of charge ordering in titanium-oxypnictides superconductors
• Double stage nematic bond-ordering above double stripe magnetism: application to BaTi${}_2$Sb${}_2$O
• Diversity of charge orderings in correlated systems
• Hidden antiferro-nematic order in Fe-based superconductor BaFe${}_2$As${}_2$ and NaFeAs above $T_S$
• Theoretical Prediction of the Nematic Orbital-Ordered State in Ti-Oxypnictide Superconductor BaTi2(As,Sb)2O
• Phase Competition and Anomalous Thermal Evolution in High-Temperature Superconductors
• Extended Falicov-Kimball model: Exact solution for finite temperatures
• Extended Falicov-Kimball model: exact solution for the ground state
• Nematic transition and highly two-dimensional superconductivity in BaTi${}_2$Bi${}_2$O revealed by ${}^{209}$Bi-nuclear magnetic resonance/nuclear quadrupole resonance measurements
• Commensurate lattice distortion in the layered titanium oxypnictides Na${}_2$Ti${}_{2}P{n}_2$O ($Pn=$ As, Sb) determined by X-ray diffraction
• New phase transition in Na${}_2$Ti${}_2$As${}_2$O revealed by Raman scattering
• Exotic phase transition and superconductivity in layered titanium-oxypnictides implied by a computational phonon analysis
• Superconductivity and intra-unit-cell electronic nematic phase in the three-band model of cuprates
• Extended Falicov-Kimball model: Hartree-Fock vs DMFT approach
• Revealing the hidden order in BaTi2As2O via nuclear magnetic resonance
• Nematic order driven by superconducting correlations
• Emergent Ising degrees of freedom above double-stripe magnetism
• Magnetism and Correlated Electrons in LaCr${}_2$Ge${}_2$N