A recently presented anisotropic generalization of the multicomponent
supersymmetric t−J model in one dimension is investigated. This model of
fermions with general spin-S is solved by Bethe ansatz for the ground state
and the low-lying excitations. Due to the anisotropy of the interaction the
model possesses 2S massive modes and one single gapless excitation. The
physical properties indicate the existence of Cooper-type multiplets of 2S+1
fermions with finite binding energy. The critical behaviour is described by a
c=1 conformal field theory with continuously varying exponents depending on
the particle density. There are two distinct regimes of the phase diagram with
dominating density-density and multiplet-multiplet correlations, respectively.
The effective mass of the charge carriers is calculated. In comparison to the
limit of isotropic interactions the mass is strongly enhanced in general.Comment: 10 pages, 3 Postscript figures appended as uuencoded compressed
tar-file to appear in Z. Phys. B, preprint Cologne-94-474