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Two Single crystals of Nb3Sn presenting the martensitic anomaly at differenttemperature and shape, as observed with specific heat measurements, were usedto study structural features in the electronic density of states with pointcontact spectroscopy. At high temperature below the martensitic anomaly, weobserved different spectroscopic characteristics. One sample displaying a wellmarked specific heat peak, shows a clear defined structure in the differentialconductance that evolves with temperature and may be associated with changes onthe density of states due to the opening of a charge density wave gap. Thosefeatures are very depending on the crystallographics characteristics of thesingle crystal examined.

Point Contact Spectroscopy of Nb3Sn Crystals: Evidence of a CDW Gap Related to the Martensitic Transition