  In this work we use the conventional hydrodynamics (HD) formalism and
incorporate the Chew-Goldberger-Low (CGL) double-adiabatic theory to evaluate
the nonlinear electrostatic ion excitations in double-degenerate (electron
spin-orbit degenerate) magnetized quantum plasmas. Based on the Sagdeev
pseudopotential method an exact general pseudopotential is calculated which
leads to the allowed Mach-number range criteria for such localized density
structures in an anisotropic magnetized plasma. We employ the criteria on the
Mach-number range for diverse magnetized quantums plasma with different
equations of state (EoS). It is remarked that various plasma fractional
parameters such as the system dimensionality, ion-temperature,
relativistic-degeneracy, Zeeman-energy, and plasma composition are involved in
the stability of an obliquely propagating nonlinear ion-acoustic wave in a
double-degenerate quantum plasma. Current study is most appropriate for
nonlinear wave analysis in the dense astrophysical magnetized plasma
environments such as white-dwarfs and neutron-star crusts where the strong
magnetic fields can be present.
