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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>17</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:math>NMR study of the local charge state in the hole-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><…
NMR measurements of the ${}^{17}\mathrm{O}$ nuclear quadrupole interactions ${}^{17}{\ensuremath{\nu}}_{Q}$ show that the charge environment of the $S=1/2$ ${\mathrm{Cu}}_{2}{\mathrm{O}}_{3}$ two-leg spin-ladder layer of hole-doped ${A}_{14}{\mathrm{Cu}}_{24}{\mathrm{O}}_{41}$ changes dramatically above a certain temperature ${T}^{*}.$ This temperature ${T}^{*}$ decreases with additional doping and is correlated with the magnetic crossover from the spin gap regime …