Boson-Mixtures at Non-Zero Temperatures

Abstract

Experimental and theoretical studies of quantum fluid mixtures are of actual interest and can provide important contributions for an understanding of fundamental macroscopic quantum many-body effects. Liquid ⁴He provides the simplest theoretical model of a binary boson mixture by assuming that a fraction of ⁴He atoms my be distinguished (say by ‘coloring’ them) from the rest. As a representative sample of more complex binary quantum fluid mixtures we may list mixtures of spin-polgrized hydrogen and tritium (H^↓-T^↓) /l/ or of isotopic helium atoms (⁶ ₃He) ⁴ ₄He/2/, solutions of tritium in helium (T^↓- ⁴He) /3/ or the classic ³He-⁴He) system /4/.