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Nuclear magnetic resonance (NMR) measurements of CuO chains of detwinnedOrtho-II YBa$_2$Cu$_3$O$_{6.5}$ (YBCO6.5) single crystals reveal unusual andremarkable properties. The chain Cu resonance broadens significantly, butgradually, on cooling from room temperature. The lineshape and its temperaturedependence are substantially different from that of a conventional spin/chargedensity wave (S/CDW) phase transition. Instead, the line broadening isattributed to small amplitude static spin and charge density oscillations withspatially varying amplitudes connected with the ends of the finite lengthchains. The influence of this CuO chain phenomenon is also clearly manifestedin the plane Cu NMR.Comment: 4 pages, 3 figures, refereed articl

physical review. b, condensed matter and materials physics

NMR evidence for Friedel-like oscillations in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>CuO</mml:mi></mml:mrow></mml:math>chains of ortho-II<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>YBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6.5</mml:mn></mml:msub></mml:mrow></mml:math>

NMR evidence for Friedel-like oscillations in theCuOchains of ortho-IIYBa2Cu3O6.5