Anomaly in YBa(2)Cu(4)O(8) charge distribution below T(c): A zero-field muon spin relaxation studyстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Zero-field muon spin-relaxation (mu SR) measurements in (63)Cu isotope enriched and natural YBa(2)Cu(4)O(8) powders are presented. The mu(+) relaxation rate is characterized by a sizeable enhancement as the temperature is lowered below the superconducting transition temperature 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 rate below T(c) originates from a change either of the mu(+) site or of the orientation of the electric-field gradient at the Cu nuclei, due to a modification in the charge distribution within CuO chains.