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

L.A.B. Olde Olthof, S.-I. Suzuki, A.A. Golubov, M. Kunieda, S. Yonezawa, Y. Maeno, Y. Tanaka

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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/SrRuO3/Sr2RuO4 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 θM, where θM is a direction of magnetization in the ferromagnet measured from the c axis, the tunneling conductances 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 θM=π/2 and HPW with θM=0) are identical. The obtained results serve as a guide to determine the pairing symmetry of the spin-triplet superconductor Sr2RuO4.

Original languageEnglish
Article number014508
JournalPhysical review B: Covering condensed matter and materials physics
Volume98
Issue number1
DOIs
Publication statusPublished - 13 Jul 2018

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