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• W2008451390 abstract "We present a comprehensive study of the phonon dispersion in an underdoped, superconducting Ca${}_{2ensuremath{-}x}$CuO${}_{2}$Cl${}_{2}$ crystal. We interpret the results using lattice dynamical calculations based on a shell model, and we compare the results to other hole-doped cuprates, in particular, to the ones isomorphic to La${}_{2ensuremath{-}x}$Sr${}_{x}$CuO${}_{4}$ (LSCO). We found that an anomalous dip in the Cu-O bond stretching dispersion develops in oxychlorides with a simultaneous marked broadening of the mode. The broadening is maximum at $ensuremath{approx}$$[ensuremath{pi}/(2a)phantom{rule{0.28em}{0ex}}0phantom{rule{0.28em}{0ex}}phantom{rule{4pt}{0ex}}0]$, which corresponds to the charge-modulation propagation vector. Our analysis also suggests that screening effects in calculations may cause an apparent cosine-shaped bending of the Cu-O bond-stretching dispersion along both the ($q$ 0 0) and ($q$ $q$ 0) directions, which is not observed on the data close to optimal doping. This observation suggests that the discrepancy between experimental data and ab initio calculations on this mode originates from an overestimation of the doping effects on the mode." @default.
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• W2008451390 date "2013-07-24" @default.
• W2008451390 modified "2023-10-17" @default.
• W2008451390 title "Phonon anomalies and lattice dynamics in the superconducting oxychlorides Ca<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>CuO<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Cl<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:…" @default.
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• W2008451390 doi "https://doi.org/10.1103/physrevb.88.014522" @default.
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