  Nonlinear ion-acoustic waves are analyzed in a non-relativistic magnetized
quantum plasma with arbitrary degeneracy of electrons. Quantum statistics is
taken into account by means of the equation of state for ideal fermions at
arbitrary temperature. Quantum diffraction is described by a modified Bohm
potential consistent with finite temperature quantum kinetic theory in the long
wavelength limit. The dispersion relation of the obliquely propagating
electrostatic waves in magnetized quantum plasma with arbitrary degeneracy of
electrons is obtained. Using the reductive perturbation method, the
corresponding Zakharov-Kuznetsov equation is derived, describing obliquely
propagating two-dimensional ion-acoustic solitons in a magnetized quantum
plasma with degenerate electrons having arbitrary electron temperature. It is
found that in the dilute plasma case only electrostatic potential hump
structures are possible, while in dense quantum plasma in principle both hump
and dip soliton structures are obtainable, depending on the electron plasma
density and its temperature. The results are validated by comparison with the
quantum hydrodynamic model including electron inertia and magnetization
effects. Suitable physical parameters for observations are identified.
