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Zero-field $\mu$SR measurements in $^{63}$Cu isotope enriched and naturalYBa$_2$Cu$_4$O$_8$ powders are presented. The temperature dependence of the$\mu^+$ relaxation rate is characterized by a sizeable enhancement below T$_c$.The comparison of the asymmetry decay in the two samples reveals that the$\mu^+$ relaxation is driven by nuclear dipole interaction from 300 K down to4.2 K. It is argued that the increase in the relaxation below T$_c$ originatesfrom a change in $\mu^+$ site, possibly due to a modification in the chargedistribution within CuO chains.Comment: 4 figure

physical review. b, condensed matter and materials physics

Anomaly in<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>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>charge distribution below<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math…

Anomaly inYBa2Cu4O8charge distribution belowTc