Point Contact Study of the Superconducting Order Parameter in RuSr2GdCu2O8
Samanta Piano, Fabrizio Bobba, Filippo Giubileo, Anna Maria Cucolo,, and Antonio Vecchione
TL;DR
This study investigates the superconducting order parameter in RuSr2GdCu2O8 using point contact spectroscopy, revealing a d-wave symmetry consistent with coexistence of magnetism and superconductivity.
Contribution
First detailed point contact conductance analysis of RuSr2GdCu2O8 showing d-wave symmetry of the superconducting order parameter.
Findings
Zero bias conductance peak observed at low temperatures
Data well fitted by a generalized BTK model for d-wave symmetry
Evidence supporting coexistence of magnetic order and superconductivity
Abstract
We have performed a detailed study of the conductance characteristics obtained by point contact junctions realized between a normal Pt/Ir tip and syntered RuSr2GdCu2O8 (Ru-1212) samples. Indeed, this compound is subject of great interest due to the coexistence of both magnetic order and bulk superconductivity. In our experiments, the low temperature tunneling spectra reproducibly show a zero bias conductance peak that can be well reproduced by a generalized BTK model in the case of d-wave symmetry of the superconducting order parameter.
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