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Motivated by the disparity between the experimentally observed properties ofsuperfluid 3He in aerogel and predictions of the Abrikosov and Gorkov theory ofsuperconducting alloys we consider effect of correlated pair-breakingimpurities on the temperature dependence of the square of magnitude of theaverage order parameter and related thermodynamic properties of a Fermisuperfluid. We show that the correlations, increasing the spectral density ofthe fluctuations with small wave vectors increase the transition temperatureand enhance a temperature region below Tc where fluctuations of the orderparameter dominate. Outside of this region we treat effect of impurities as aperturbation and express corrections to thermodynamic properties in terms ofthe structure factor of impurities. Assuming a simple model expression forcorrelation function of aerogel we find corrections to the temperaturedependence of the NMR frequency shifts for A-like and B-like phases of 3He andcompare these with experimental data.

Coherent reaction of Fermi superfluid on correlated disorder