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The melting of the magnetic vortex lattice has been observed in high-Tcsuperconductors in many experiments by different groups and is regarded asconfirmed. To date, only one group claims to have observed the vortex-latticemelting in the low-Tc superconductor Nb3Sn in specific-heat measurements. Wemeasured the same Nb3Sn single crystal with a differential-thermal analysismethod. We report on the absence of any sign of vortex-lattice melting in ourdata and discuss the possible reasons for this discrepancy. In addition weconfirm the observation of a small peak-like anomaly near the transition tosuperconductivity which is likely related to thermal fluctuations.

Presence of a fluctuation related peak but absence of vortex-lattice melting in Nb3Sn in high resolution specific-heat measurements