Intergrain Ordering of a Superconductive Ceramic of YBa_2Cu_4O_8 at Zero External Magnetic Field Studied by Linear and Nonlinear Transport Coefficients

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The intergrain ordering in a sttperconductive cerannic of' YBl2CL14O8 at zero external rnag-netic field is investigated by AC resistivity raaeastrrezaaents. The third harrnonic in-phase voltageconaponent V3, to a weak AC cturrent shows a distinct uaegatixze peak across the intergrain tran-sition tenarcerature Tcx, but not across the intra:rain one V'CI ('Z'C2< Tct). A divergence of'the nonlinear resistivity pz is concltrded at 'Z'C2 in the linait of vanishing AC current, while thelinear resistivity pg remains finite even at azad lcelow 'Z'C2. Sttch characteristic critical behaviorsof the intergrain ordering of the present strperconductive ceramic strongly suggest a chiral glassordering recently predicted to occur in high-V'0strperconductive ceramics.
社団法人日本物理学会の論文
1999-03-15