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Based on the one component plasma model, a new dispersion relation and group velocity of elliptically polarized extraordinary electromagnetic waves in a superdense quantum magnetoplasma are derived.The group velocity of the extraordinary wave is modified due to the quantum forces and magnetization effects within a certain range of wave numbers.It means that the quantum spin-l/2 effects can reduce the transport of energy in such quantum plasma systems.Our work should be of relevance for the dense astrophysical environments and the condensed matter physics.