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Sn is a well-known classical superconductor on the border between type I andtype II with critical temperature of 3.722K and critical field of 0.031T. Weshow by means of specific heat and electric magneto-transport data that itscritical parameters can be dramatically increased if it is brought in the formof loosely bound bundles of thin nanowires. The specific heat displays apronounced double phase transition at 3.7K and 5.5K, which we attribute to theinner 'bulk' contribution of the nanowires and to the surface contribution,respectively. The latter is visible only because of the large volume fractionof the surface layer in relation to their bulk inner volume. The uppertransition coincides with the onset of the resistive transition, while zeroresistance is gradually approached below the lower transition. The largecoherence length of 230nm at 0K likely actuates a Josephson coupling betweenadjacent neighboring nanowires and thus suppresses the effect of 1D phasefluctuations along the nanowires, and stabilizes 3D phase coherence throughoutthe entire network with zero resistance. A magnetic field of more than 3T isrequired to restore the normal state, which means that the critical field isenhanced by about two orders of magnitude with respect to Sn in its bulk form.

Dramatic increase of the onset critical temperature and critical field of elemental Sn in the form of thin nanowires