DOI: 10.1103/physrevb.73.064514
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Abstract: The results of Point Contact Andreev Reflection Spectroscopy on polycrystalline RuSr2GdCu2O8 pellets are presented. The wide variety of the measured spectra are all explained in terms of a modified BTK model considering a d-wave symmetry of the superconducting order parameter. Remarkably low values of the energy gap ∆ = (2.8 ± 0.2)meV and of the 2∆/kBTc ≃ 2 ratio are inferred. From the temperature evolution of the dI/dV vs V characteristics we extract a sublinear temperature dependence of the superconducting …

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