Theory of Spin polarized Tunneling in Superconducting Sr2RuO4
Nobukatsu Yoshida, Yukio Tanaka, Junichiro Inoue, Satoshi Kashiwaya
TL;DR
This paper develops a theoretical model for tunneling conductance in ferromagnetic metal/insulator/triplet superconductor junctions, focusing on Sr2RuO4, and predicts how exchange interactions affect conductance differently for pairing states.
Contribution
It introduces a comprehensive theory for tunneling conductance in ferromagnetic-superconductor junctions considering both unitary and non-unitary triplet pairing states.
Findings
Conductance decreases with increased exchange interaction for unitary pairing.
Conductance behavior differs significantly between unitary and non-unitary pairing states.
The model provides insights into the pairing symmetry of Sr2RuO4.
Abstract
A theory of tunneling conductance in ferromagnetic metal/insulator/triplet - supercondcutor junctions is presented for unitary and non-unitary spin triplet pairing states which are promising candidates for the superconducting paring symmetry of Sr2RuO4. As the magnitude of the exchange interaction in the ferromagnetic metal is increased, the conductance for the unitary pairing state below the energy gap is reduced in contrast to the case for the non-unitary pairing state.
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