Commensurate lattice distortion in the layered titanium oxypnictides Na$_{2}$Ti$_{2}Pn_{2}$O ($Pn =$ As, Sb) determined by X-ray diffraction

We report single crystal X-ray diffraction measurements on Na $_{2}$ Ti $_{2} P n_{2}$ O ( $P n$ = As, Sb) which reveal a charge superstructure that appears below the density wave transitions previously observed in bulk data. From symmetry-constrained structure refinements we establish that the associated distortion mode can be described by two propagation vectors, ${\bf q}{1} = (1/2, 0, l) $a n d$ {\bf q}{2} = (0, 1/2, l) $, w i t h$ l=0 $(S b) o r$ l = 1/2$ (As), and primarily involves in-plane displacements of the Ti atoms perpendicular to the Ti–O bonds. The results provide direct evidence for phonon-assisted charge density wave order in Na $_{2}$ Ti $_{2} P n_{2}$ O and identify a proximate ordered phase that could compete with superconductivity in doped BaTi $_{2}$ Sb $_{2}$ O.

Commensurate lattice distortion in the layered titanium oxypnictides Na $_{2}$ Ti $_{2} P n_{2}$ O ( $P n =$ As, Sb) determined by X-ray diffraction

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Commensurate lattice distortion in the layered titanium oxypnictides Na $_{2}$ Ti $_{2} P n_{2}$ O ( $P n =$ As, Sb) determined by X-ray diffraction

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Commensurate lattice distortion in the layered titanium oxypnictides Na22​Ti2Pn22​Pn2​O (Pn=Pn= As, Sb) determined by X-ray diffraction

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Commensurate lattice distortion in the layered titanium oxypnictides Na22​Ti2Pn22​Pn2​O (Pn=Pn= As, Sb) determined by X-ray diffraction

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Commensurate lattice distortion in the layered titanium oxypnictides Na $_{2}$ Ti $_{2} P n_{2}$ O ( $P n =$ As, Sb) determined by X-ray diffraction

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Commensurate lattice distortion in the layered titanium oxypnictides Na $_{2}$ Ti $_{2} P n_{2}$ O ( $P n =$ As, Sb) determined by X-ray diffraction

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