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چکیده
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investigated the properties of liquid 3He in the presence of magnetic eld at nite tem- perature. Our calculations have been done using the variational method based on cluster expansion of the energy functional. Our results show that the low eld magnetic sus- ceptibility obeys Curie law at high temperatures. This behavior is in a good agreement with the experimental data as well as the molecular eld theory results in which the spin dependency has been introduced in correlation function. Reduced susceptibility as a function of temperature as well as reduced temperature has been also investigated, and again we have seen that the spin-dependent correlation function leads to a good agree- ment with the experimental data. The Landau parameter, Fa 0 , has been calculated, and for this parameter, a value about ????0:75 has been found in the case of spin{spin cor- relation. In the case of spin-independent correlation function, this value is about ????0:7. Therefore, inclusion of spin dependency in the correlation function leads to a more com- patible value of Fa 0 with experimental data. The magnetization and susceptibility of liquid 3He have also been investigated as a function of magnetic eld. Our results show a downward curvature in magnetization of system with spin-dependent correlation for all densities and relevant temperatures. A metamagnetic behavior has been observed as a maximum in susceptibility versus magnetic eld, when the spin{spin correlation has been considered. This maximum occurs at 45 T B 100 T for all densities and temperatures. This behavior has not been observed in the case of spin-independent correlation function.
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