- Tytuł:
- Weak $\text{}^{3}He$ Pairing in $\text{}^{3}He-He(II)$ Mixtures
- Autorzy:
-
Sandouqa, A.
Joudeh, B.
Al-Sugheir, M.
Ghassib, H. - Powiązania:
- https://bibliotekanauki.pl/articles/1505042.pdf
- Data publikacji:
- 2011-06
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
67.60.-g
67.60.G-
67.60.Fp - Opis:
- In this paper a theoretical study of a possible phase transition in dilute $\text{}^3He-He(II)$ mixtures is presented using the Galitskii-Migdal-Feynman formalism. The effective scattering length is calculated from the Galitskii-Migdal-Feynman T-matrix, which is essentially the effective scattering amplitude dependent on the medium. It is found that at very low $\text{}^3He$ concentrations the s-wave effective scattering length for ^3He-He(II) varies discontinuously from positive to negative values at some critical concentration. This indicates a crossover from a regime with dimers to another with the Cooper pairs. The binding energy of the weakly-bound dimers $\text{}^3He_2$ is computed. The effective p-wave scattering lengths are calculated and compared to the effective s-wave scattering lengths at low and high concentrations. It is found that p-scattering has an important effect on the instability of these mixtures at concentrations x > 1%. Finally, the transport coefficients are computed and compared to the theoretical predictions of Fu and Pethick and the experimental results of König and Pobell.
- Źródło:
-
Acta Physica Polonica A; 2011, 119, 6; 807-813
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł