Abstract
Nonlinear structures associated with the kinetic Alfvén waves such as double layers (DLs) are investigated in a multicomponent plasma consisting of cold ions with superthermal electrons and positrons. The Sagdeev potential has been derived using two-potential theory in a low-β case. It is shown that our current consideration supports both compressive and rarefactive DLs. The effects of positron concentration and superthermality on DLs are studied. It is shown that the characteristics of the kinetic Alfvénic DLs, i.e., their profile is significantly modified due to superthermality and positron concentration. Our present investigation could be useful for understanding the kinetic Alfvénic DLs in the electron-positron-ion plasma with kappa distributed electrons and positrons.