Theory of tunneling spectroscopy of normal metal/ferromagnet/spin-triplet superconductor junctions

Abstract

We study the tunneling conductance of a ballistic normal metal / ferromagnet / spin-triplet superconductor junction using the extended Blonder-Tinkham-Klapwijk formalism as a model for a $c$-axis oriented Au / SrRuO${}_3$ / Sr${}_2$RuO${}_4$ junction. We compare chiral $p$-wave (CPW) and helical $p$-wave (HPW) pair potentials, combined with ferromagnet magnetization directions parallel and perpendicular to the interface. For fixed ${\theta }_M$, where ${\theta }_M$ is a direction of magnetization in the ferromagnet measured from the $c$-axis, the tunneling conductance of CPW and HPW clearly show different voltage dependencies. It is found that the cases where the $d$-vector is perpendicular to the magnetization direction (CPW with ${\theta }_M=\pi /2$ and HPW with ${\theta }_M=0$) are identical. The obtained results serve as a guide to determine the pairing symmetry of the spin-triplet superconductor Sr${}_2$RuO${}_4$.

arXiv comment12 pages, 7 figures. There is also a supplementary (not uploaded)

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Cited by in corpus (9)

• Orientation-dependent transport in junctions formed by $d$-wave altermagnets and $d$-wave superconductors
• Identifying possible pairing states in Sr${}_2$RuO${}_4$ by tunneling spectroscopy
• Spin susceptibility for orbital-singlet Cooper pair in the three-dimensional Sr${}_2$RuO${}_4$ superconductor
• Effects of the phase coherence on the local density of states in superconducting proximity structures
• Observation of superconducting gap spectra of long-range proximity effect in Au/SrTiO${}_3$/SrRuO${}_3$/Sr${}_2$RuO${}_4$ tunnel junctions
• Spin transport and Spin Tunnelling Magneto-Resistance (STMR) of F$|$NCSC$|$F spin valve
• Effect of Rashba spin-orbit coupling, magnetization and mixing of gap parameter on tunnelling conductance in F$|$NCSC junction of an F$|$S$|$F spin valve
• Supercurrent reversal in Zeeman-split Josephson junctions
• Josephson effects in the spin-triplet superconductor/altermagnet/spin-triplet superconductor junctions: the detection of the intrinsic $\mathbf{d}$-vector