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A complex plasma medium (containing Cairns nonthermal electron species,adiabatically warm inertial ion species, and stationary positively charged dust(PCD) species (making a plasma system very complex) is considered. The effectsof PCD species, nonthermal electron species, and adiabatic ion-temperature onion-acoustic (IA) solitary waves (SWs) and double layers (DLs) are investigatedby the pseudo-potential approach, which is valid for the arbitrary amplitudetime-independent SWs and DLs. It is observed that the presence of the PCDspecies reduces the phase speed of the IA waves, and consequently supports theIA subsonic compressive SWs in such electron-ion-PCD plasmas. On the otherhand, the increase in both adiabatic ion-temperature and the number ofnonthermal or fast electrons causes to reduce the possibility for the formationof the subsonic SWs, and thus convert subsonic SWs into supersonic ones. It isalso observed that after at a certain value of the nonthermal parameter, the IAsupersonic SWs with both positive and negative potentials as well as the DLswith only negative potential exist. The applications of the work in spaceenvironments (viz. Earth's mesosphere, cometary tails, Jupiter's magnetosphere,etc.) and laboratory devices, where the warm ion and nonthermal electronspecies along with PCD species have been observed, are briefly discussed.

Solitary waves and double layers in complex plasma media