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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Superconducting materials
Metals
Spectroscopy
metals
spectroscopy
Magnetization
magnetization
Ballistics
ballistics
formalism
Electric potential
electric potential
symmetry
Direction compound

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Olde Olthof, L.A.B. ; Suzuki, S.-I. ; Golubov, A.A. ; Kunieda, M. ; Yonezawa, S. ; Maeno, Y. ; Tanaka, Y. / Theory of tunneling spectroscopy of normal metal/ferromagnet/spin-triplet superconductor junctions. In: Physical review B: Covering condensed matter and materials physics. 2018 ; Vol. 98, No. 1.
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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.",
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Theory of tunneling spectroscopy of normal metal/ferromagnet/spin-triplet superconductor junctions. / Olde Olthof, L.A.B.; Suzuki, S.-I.; Golubov, A.A.; Kunieda, M.; Yonezawa, S.; Maeno, Y.; Tanaka, Y.

In: Physical review B: Covering condensed matter and materials physics, Vol. 98, No. 1, 014508, 13.07.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Olde Olthof, L.A.B.

AU - Suzuki, S.-I.

AU - Golubov, A.A.

AU - Kunieda, M.

AU - Yonezawa, S.

AU - Maeno, Y.

AU - Tanaka, Y.

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AB - 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.

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