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A new class of LRS Bianchi type ${\rm VI}_{0}$ cosmological models with freegravitational fields and a variable cosmological term is investigated inpresence of perfect fluid as well as bulk viscous fluid. To get thedeterministic solution we have imposed the two different conditions over thefree gravitational fields. In first case we consider the free gravitationalfield as magnetic type whereas in second case `gravitational wrench' of unit`pitch" is supposed to be present in free gravitational field. The viscositycoefficient of bulk viscous fluid is assumed to be a power function of massdensity. The cosmological constant $\Lambda$ is found to be a decreasingfunction of time and positive which is corroborated by results from recentsupernovae Ia observations. The physical and geometric aspects of the modelsare discussed.

A New Class of LRS Bianchi Type ${\rm VI}_{0}$ Universes with Free Gravitational Field and Decaying Vacuum Energy Density