Abstract

Synthesized under high pressure, hydrogen-substituted NdFeAsO${}_{0.6}$H${}_{0.36}$ (with a critical temperature of 48 K) possibly demonstrates a double-dome superconducting state in its phase diagram, thus foreshadowing extraordinary physics as compared with other iron-based oxypnictides. Ballistic Andreev transport in superconductor--normal metal--superconductor junctions provides direct information about the superconducting order parameter at any temperatures up to ${T}_{c}$, and specific boson emission. The authors discuss here the characteristics found of the multiple-band superconducting state, the boson energy, and their nature.

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