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

P. Carretta; A. Keren; J. S. Lord; I. Zucca; S. M. Kazakov; J. Karpinski

doi:10.1103/PhysRevB.71.052507

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

Strongly Correlated Electrons 2009-11-10 v1

Authors: P. Carretta , A. Keren , J. S. Lord , I. Zucca , S. M. Kazakov , J. Karpinski

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Abstract

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.

Keywords

muSR charge distribution YBa2Cu4O8 superconductor nuclear dipole interaction CuO chains

Cite

@article{arxiv.cond-mat/0407474,
  title  = {Anomaly in YBa2Cu4O8 charge distribution below Tc: a zero-field muSR study},
  author = {P. Carretta and A. Keren and J. S. Lord and I. Zucca and S. M. Kazakov and J. Karpinski},
  journal= {arXiv preprint arXiv:cond-mat/0407474},
  year   = {2009}
}

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