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Ferromagnetic half-metal Co$_2$CrAl films and tunnel contacts Co$_2$CrAl -insulator (I) - Pb are fabricated and investigated. It is found that thenormalized differential conductivity $\sigma ^{\rm FS} $ of such tunneljunctions with low resistance is larger than the normalized differentialconductivity $\sigma ^{\rm NS} $ of known normal metal - I - superconductortype tunnel junctions. It is shown that the observed increase in $\sigma ^{\rmFS} $ is caused by the accumulation of spin polarized electrons in asuperconductor and can be used for estimating the spin polarization degree $P$in ferromagnets. This method shows that $P$ of L2$_1$-type ordered Co$_2$CrAlHeusler alloy films at $T = 4.2{\rm K}$ is close to 1.

Tunnel effect in ferromagnetic half-metal Co$_2$CrAl-superconductor heterostructures