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A comparative study of magnetic behavior in a DC magnetic field up to 19Tesla has been undertaken on different Nb3Sn samples, i.e. single crystals,polycrystal samples and multifilamentary wires. From the 1st and 3rd harmonicsof the AC magnetic susceptibility a peak effect was experimentally observed inthe single crystal and in the polycrystal, whereas this phenomenon is absent inthe measured wires. The corresponding H vs T phase diagram reveals a differentbehavior between wires on one hand and polycrystalline and single crystalsamples on the other. In particular, from the 3rd harmonics it has beenobserved that vortex thermally activated flux creep phenomena are relevant inthe wires, whereas the static critical state models are more appropriate todescribe single crystals.Comment: 9 pages, 9 figures, to be published on Advances in Cryogenic  Engineering, Vol. 51-52 (CEC-ICMC05, Keystone, Colorado, 28 August-3  September 2005

H(T) Phase Diagram in Nb3Sn: A Different Behavior in Single Crystals, Polycristalline Samples and Multifilamentary Wires