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We study systematically the scattering processes and the conductance spectrain nodal-line semimetalsuperconductor junctions using the extendedBlonder-Tinkham-Klapwijk theory. The coexistence of peculiar quadruplereflections are found, which are the specular normal reflection, theretro-normal reflection, the specular Andreev reflection and the retro-Andreevreflection. The incident angle dependence and the quasiparticle energydependence of the double normal reflections and the double Andreev reflectionsare investigated under various values of parameters such as the interfacialbarrier height, the chemical potentials, and the orbital coupling strength. Itis found that the appearance and the disappearance of the reflections and theirmagnitudes can be controlled through tuning these parameters. The scatteringmechanism for the reflections are analyzed in details from the viewpoint of theband structure. We also investigate the conductance spectra for the junctions,which show distinctive features and strong anisotropy about the orientationrelationships of the nodal line and interface. The unique scattering processesand conductance spectra found in the junctions are helpful in designingsuperconducting electronic devices and searching for the nodal line inmaterials experimentally.

Double Andreev reflections and double normal reflections in nodal-line semimetal-superconductor junctions