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- W2044932013 abstract "We have studied experimentally the electrical conductivity and specific heat near the superconducting transition of granular samples of YBa2Cu3O7−δ, YBa2(Cu2.98Zn0.02)O7−δ and GdBa2Cu3O7−δ. The results show that the transition proceeds in two stages. Careful analysis of the conductivity in the regime of approach to the zero resistance state reveals the occurrence of a coherence transition, which is related to the connective nature of the granular samples. This transition occurs when the fluctuating phases of the order parameter in individual grains become long-range ordered. We obtain the exponent for fluctuation conductivity and the relevant critical temperature, Tco, which is close to the point where resistivity vanishes. The specific heat results, when analyzed as dC/dT, show a weak but reproducible cusp-like anomaly at Tco. This finding gives strong support to the interpretation of the coherence transition as a genuine critical phenomenon." @default.
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- W2044932013 date "1999-01-01" @default.
- W2044932013 modified "2023-10-18" @default.
- W2044932013 title "Coherence transition in granular high temperature superconductors" @default.
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- W2044932013 doi "https://doi.org/10.1016/s0921-4534(98)00617-0" @default.
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