Physics – Condensed Matter – Superconductivity
Scientific paper
2005-09-13
Phys. Rev. B 73, 064514 (2006)
Physics
Condensed Matter
Superconductivity
8 pages, 7 EPS figures. Accepted in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.73.064514
The results of Point Contact Andreev Reflection Spectroscopy on polycrystalline RuSr$_2$GdCu$_2$O$_8$ pellets are presented. The wide variety of the measured spectra are all explained in terms of a modified BTK model considering a \emph{d-wave} symmetry of the superconducting order parameter. Remarkably low values of the energy gap $\Delta=(2.8\pm 0.2)meV$ and of the $2\Delta/k_BT_c\simeq 2$ 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 $H_{c_2}\simeq 30 T$ 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.
Bobba Fabrizio
Cucolo Anna Maria
Giubileo Filippo
Gombos Marcello
Piano Samanta
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