Abstract:
It has been shown by the example of 3He in aerogel that the correlation in the position of impurities may have a considerable effect on the transition temperature Tc of a Fermi fluid to an unconventional superfluid or superconducting state if the correlation radius of the system of impurities exceeds the correlation length ξ0 of the emerging superfluid phase. A decrease in Tc of 3He in aerogel has been expressed in terms of the structure factor of aerogel. Taking into account the fractal structure of aerogel provides a simple formula that satisfactorily describes the observed decrease in Tc.
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