Proposed experiment to test existence of horizontal nodal lines in Sr$_{2}$RuO$_{4}$

Since the original proposal of an unconventional chiral order parameter in the ruthenate perovskite superconductor Sr$_{2}$RuO$_{4}$, much attention has been given to the possibility of horizontal nodal lines on the predominant $\gamma$ cylindrical Fermi surface given thermodynamic evidence, such as power law specific heat and spin relaxation rate behavior, for low-lying quasiparticle excitations in this material. Here I propose Andreev and tunneling spectroscopy experiments exploiting the peculiar Fermi surface topology of the normal electrode graphite to determine whether such nodal lines in fact exist.