Physics – Condensed Matter – Superconductivity
Scientific paper
2008-06-09
Physics
Condensed Matter
Superconductivity
9 pages, 1 figure, Russian version accepted for publication in "Pis`ma v ZhETF"
Scientific paper
10.1134/S0021364008130134
Using liquid 3He in aerogel as an example, it is shown that correlations in positions of impurities affect the temperature $T_c$ of transition of Fermi liquid in an unconventional superfluid or superconductive state. The effect is significant if the correlation length for impurities is greater than the coherence length in the superfluid or superconductive state $\xi_0$. For 3He in aerogel the suppression of $T_c$ is expressed in terms of the structure factor of aerogel. With the account of the fractal structure of aerogel a simple expression is obtained for the decrease of $T_c$ from its clean value. This expression is in a satisfactory agreement with experimental data.
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