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- W2033388610 abstract "Systematic measurements of electrical magnetoconductivity near the coherence transition of granular DyBa2Cu3O7-δ ultra-thin films are reported. Two type of experiments were performed: diverse current densities up to 80 A/cm2 were applied in the absence of magnetic field H and magnetic fields ranging from 0 to 2.5 kOe were applied perpendicular to the structural Cu–O planes to study the phase-glass transition. Close to the zero resistance state, the measurements reveal the occurrence of a coherence transition, where the phases of the order parameter in individual grains become long-range ordered. The critical temperature, Tc0(H), for this transition is close to the point where the resistivity vanishes. A strong enlargement of the fluctuation interval preceding the coherence transition is caused by the applied magnetic field. The critical conductivity behavior for the coherence transition is interpreted within a 3D-XY model where disorder and frustration are relevant. It was evidenced that close to the coherence transition, the correlation length scales as a power law of temperature with a temperature-dependent critical exponent ν. In the presence of external magnetic fields, the corresponding value of ν is consistent with the 2D-gauge-glass model. In the absence of applied magnetic fields, the value of ν is not the same as for the 2D-phase-glass model. A scaling into the framework of the vortex-glass theory shows that the chiral- and gauge-glass behaviors are in different dynamic universality classes." @default.
- W2033388610 created "2016-06-24" @default.
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- W2033388610 date "2002-11-20" @default.
- W2033388610 modified "2023-09-27" @default.
- W2033388610 title "EVIDENCE OF TWO-DIMENSIONAL GAUGE-GLASS BEHAVIOR NEAR THE COHERENCE TRANSITION OFDyBa2Cu3O7-δULTRA-THIN FILMS" @default.
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- W2033388610 doi "https://doi.org/10.1142/s021798490200472x" @default.
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