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Investigations of the spin dynamics of the geometrically frustratedpyrochlore (Tb_pY_{1-p})_2Ti_2O_7, using muon spin relaxation and neutron spinecho, as a function of magnetic coverage p, have been carried out. Our majorfinding is that paramagnetic fluctuations prevail as T->0 for all values of p,and that they are sensitive to dilution, indicating a cooperative spin motion.However, the percolation threshold p_c is not a critical point for thefluctuations. We also find that the low temperatures spectral density has a 1/fbehavior, and that dilution slows down the spin fluctuations.Comment: 5 pages, 5 figur

physical review letters

Dynamic Properties of a Diluted Pyrochlore Cooperative Paramagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mrow><mml:mi>Tb</mml:mi></mml:mrow><mml:mi>p</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>Ti</mml:…

Dynamic Properties of a Diluted Pyrochlore Cooperative Paramagnet(TbpY1−p)2Ti