Journal
PHYSICAL REVIEW B
Volume 73, Issue 6, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.73.064514
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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 Blonder-Tinkham-Klapwijk model considering a d-wave symmetry of the superconducting order parameter. Remarkably low values of the energy gap Delta=(2.8 +/- 0.2) meV and of the 2 Delta/k(B)T(c)similar or equal to 2 ratio are inferred. From the temperature evolution of the dI/dV vs V characteristics we extract a sublinear temperature dependence of the superconducting energy gap. The magnetic field dependence of the conductance spectra at low temperatures is also reported. From the Delta vs H evolution, a critical magnetic field H-c2 similar or equal to 30 T is inferred. To properly explain the curves showing gap-like features at higher voltages, we consider the formation of a Josephson junction in series with the point contact junction, as a consequence of the granularity of the sample.
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