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Tetravalency and magnetic phase diagram in the heavy-fermion superconductor UPd2Al3.

Measurements of the dc susceptibility χ(T), dc magnetization, magnetoresistivity, and magnetostriction are utilized to delineate the magnetic B-T phase diagram of the antiferromagnetically ordered (T N =14K) heavy-fermion superconductor (T c =2K)UPd 2 AL 3 . The single-crystal data reveal three antiferromagnetic phases for B⊥c, but only one for Bc. The anisotropic χ(T) in the paramagnetic state suggests a tetravalent configuration of uranium