Properties of tunneling conductance spectra of a ferromagnetic-insulator-anisotropic spin triplet superconductor junction are theoretically investigated. The Andreev reflection and transmission of quasiparticles at the interfaces, parallel to the c-axis of the superconductor 2 4 Sr RuO , for unitary p-wave and nonunitary states are discussed. Asymmetry of the Andreev reflection amplitude with respect to the boundary normal is analyzed. Discussion of the resonance peak in this reflection is also performed. The essential influence of the magnitude and direction of the exchange field on the conduction spectrum is investigated.
The properties of tunneling conductance spectra of a ferromagnetic metal-insulator-spin triplet superconductor junction are investigated. We take into account higher (p-wave and f-wave) relative angular momentum contributions to the superconducting order parameter and investigate the quasiparticle tunneling for both the unitary and non-unitary pairing states, which are consistent with the experimental data for Sr 2 RuO 4 . The zero-bias conductance peaks due to the quasiparticle bound states at the interface boundary and the gap-like structure of the conductance depending on the orientation of the junction are obtained and the role of the Andreev reflection in identifying the pairing symmetry in the oddparity superconductors is also discussed.Introduction The nature of the superconductivity in Sr 2 RuO 4 has been the subject of intense theoretical and experimental investigations. Although Sr 2 RuO 4 has the same layered perovskite structure as the high T C cuprate superconductors, their electronic structure as well as their superconducting pairing states are quite different. There is a clear evidence that the superconducting state in Sr 2 RuO 4 is not a conventional s-wave state [1]. The flat Knight shift observed in Sr 2 RuO 4 when the temperature crosses T C evidently shows that this system is a spin-triplet, odd parity superconductor. Muon spin rotation (mSR) experiments suggest that the time reversal symmetry is broken for the superconductor Sr 2 RuO 4 . On the other hand the spin polarized tunneling spectroscopy experiments provide the most useful information for the determination of the symmetry of the orbitally anisotropic pair potential. In our paper we analyze the properties of charge tunneling spectra in ferromagnet/insulator/triplet superconductor (F/I/TS) junctions.We consider the tunneling effect in F/I/TS junctions, which are a sensitive tool for distinguishing between unitary and non-unitary states. We hope that the properties of the Andreev reflection of holes and the transmission of electron-like and hole-like quasiparticles allow to identify the pairing symmetry in Sr 2 RuO 4 . Therefore we discuss the characteristic features of the Andreev reflection processes which allow to distinguish the unitary and non-unitary pairing states proposed for Sr 2 RuO 4 . Especially, we discuss both the asymmetry of the Andreev reflection amplitudes with respect to the boundary normal and the behaviour of the resonance peak in the Andreev reflection amplitude. Moreover, when the superconducting pairing state has odd parity, then the spin polarized tunneling current spectra are sensitive to the direction Q M of the magnetization axis in the ferromagnet. Usually, various tunneling experiments reveal a zero-bias conductance peak (ZBCP), which is a characteristic effect for all unconventional superconductors regardless of the odd or even parity of the superconducting state.
We discuss the tunneling conductance in a ferromagnet-insulator-triplet superconductor junction. We consider the superconducting order parameters with spin triplet pairing having nodes. The nodal structure of the order parameter has been recently confirmed experimentally in Sr2RuO4. In particular, we study how a mid-gap structure of the tunnelling conductance depends on the phase difference of the pairing potential as well as on the orientation of the interface.
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