Josephson effect in point contacts between “f-wave” superconductors

Abstract

Kolesnichenko Yu. A.Josephson effect in point contacts between «f-wave» superconductorsMahmoodi R., Shevchenko S. N., and Kolesnichenko Yu. A.Josephson effect in point contacts between «f-wave» superconductors A stationary Josephson effect in point contacts between triplet superconductors is analyzed theoretically for most probable models of the order parameter in UPt 3 and Sr 2 RuO 4 . The consequence of misorientation of crystals in the superconducting banks on this effect is considered. We show that different models for the order parameter lead to quite different current-phase relations. For certain angles of misorientation a boundary between superconductors can generate a spontaneous current parallel to the surface. In a number of cases the state with a zero Josephson current and minimum of the free energy corresponds to a spontaneous phase difference. This phase difference depends on the misorientation angle and may possess any value. We conclude that experimental investigations of the current-phase relations of small junctions can be used for determination of the order parameter symmetry in the superconductors mentioned above. PACS: 74.50.+r, 74 70. Tx, 74.80.Fp

Spin polarized transport in the weak link between f-wave superconductors

“…The charge current-phase diagrams have been obtained before in paper 16 and they are totally different from the case of conventional superconductors in the paper 22 . At the phase values of φ = 0, φ = π and φ = 2π, in which the charge current is exactly zero, the spin current has the finite values and may select its maximum value.…”

“…5) In Fig.2, the perpendicular component of the spin and charge current in terms of the external phase difference φ for the case of the planar state (16), geometry (i) and for two different misorientations are plotted. The solid line is the charge current-phase dependence 16 . Also, at the φ = 0, φ = π and φ = 2π, the charge current (Josephson current) is zero while the spin current has the finite value.…”

“…Using these two models of order parameters (15,16) and solutions to the Eilenberger equations (11,12), we have calculated the spin current and charge current densities at the interface numerically. These numerical results are listed below:…”

“…Also, the Josephson effect in the point contact between triplet superconductors has been studied in Ref. 16 . These weaklink structures have been used to demonstrate the order parameter symmetry in Ref.…”

Josephson current in d-wave superconductor junctions with ferromagnetic insulator

“…It is known that the critical current of SFS junctions changes its sign and the ground state from 0 to π as a function of the ferromagnetic layer [16], meanwhile, Rahnavard et al [17] found the spin current associated with the 0 − π transition in a clean superconductor/normal metal/superconductor Josephson junction with triplet f-wave superconductors. There have been several theoretical doing works [18][19][20].…”