Anomaly in YBa2Cu4O8 charge distribution below Tc: a zero-field muSR study

Details Anomaly in YBa2Cu4O8 charge distribution below Tc: a zero-field muSR study Anomaly in YBa2Cu4O8 charge distribution below Tc: a zero-field muSR study

2004-07-19

arxiv.org/abs/cond-mat/0407474v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures

Scientific paper

10.1103/PhysRevB.71.052507

Zero-field $\mu$SR measurements in $^{63}$Cu isotope enriched and natural YBa$_2$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 to 4.2 K. It is argued that the increase in the relaxation below T$_c$ originates from a change in $\mu^+$ site, possibly due to a modification in the charge distribution within CuO chains.

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