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We report the observation of nuclear quadrupole resonance (NQR) of Cu fromthe sites near the doping center in the spin-Peierls systemCuGe$_{1-x}$Si$_{x}$O$_3$. The signal appears as the satellites in the Cu NQRspectrum, and has a suppressed nuclear spin-lattice relaxation rate indicativeof a singlet correlation rather than an enhanced magnetic correlation near thedoping center. Signal loss of Cu nuclei with no neighboring Si is alsoobserved. We conclude from these observations that the doping-induced momentsare not in the vicinity of the doping center but rather away from it.Comment: 4 pages, 4 figures, accepted for publication in Phys. Rev. Let

physical review letters

Absence of Edge Localized Moments in the Doped Spin-Peierls System<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CuGe</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Si</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi…

Absence of Edge Localized Moments in the Doped Spin-Peierls SystemCuGe1−xSix