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• W4207059470 abstract "We have studied the local structure of ${mathrm{La}}_{0.5ensuremath{-}x}{mathrm{Na}}_{0.5+x}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$ superconductor by As $K$-edge x-ray absorption fine structure measurements as a function of temperature in a wide range of hole doping ($x$ = 0.0 to 0.35). A substantial change in the local structure around the arsenic atom has been observed with doping. The axial As-${mathrm{As}}_{a}$ bond length is found to be >$ensuremath{sim}3.12$ AA{}, indicating that the system is in its collapsed tetragonal phase. The temperature-dependent mean square relative displacements reveal that the As-Fe bond is relatively weak in the undoped sample; however, it gets stronger with hole doping. On the other hand, the axial As-${mathrm{As}}_{a}$ bond tends to get weaker in the optimally doped regime ($x$ = 0.25--0.35), suggesting the possible role of increased As atom displacements in the axial direction in the superconducting phase of these materials. Consistently, the arsenic height from the Fe-Fe plane shows a gradual increase in the optimally doped regime. Apart from providing a quantitative information on the local structure of ${mathrm{La}}_{0.5ensuremath{-}x}{mathrm{Na}}_{0.5+x}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$, the results suggest a vital role of electron-lattice coupling and axial As atom displacements in the superconductivity of these iron-based materials." @default.
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• W4207059470 date "2022-01-24" @default.
• W4207059470 modified "2023-10-15" @default.
• W4207059470 title "Determination of the local structure of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Na</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>As</mml:mi></…" @default.
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• W4207059470 doi "https://doi.org/10.1103/physrevb.105.024519" @default.
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