Pairing state in the ruthenocuprate superconductor RuSr2GdCu2O8: A point-contact Andreev reflection spectroscopy study
Samanta Piano, Fabrizio Bobba, Filippo Giubileo, Anna Maria Cucolo, Marcello Gombos, Antonio Vecchione
DOI 10.1103/PhysRevB.73.064514 · Physical Review B
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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 Blonder–Tinkham–Klapwijk model considering a d-wave symmetry of the superconducting order parameter. Remarkably low values of the energy gap Δ=(2.8±0.2)meV and of the 2Δ∕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 energy gap. The magnetic field dependence of the conductance spectra at low temperatures is also reported. From the Δ vs H evolution, a critical magnetic field Hc2≃30T 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | zero_resistance |
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