Physics – Condensed Matter – Superconductivity
Scientific paper
2006-04-04
Phys. Rev. B 74, 104502 (2006)
Physics
Condensed Matter
Superconductivity
12 pages, 5 figures new extended version, more figures added, more detailed discussion about the vortex melting transition
Scientific paper
10.1103/PhysRevB.74.104502
The range of critical thermal fluctuations in classical bulk superconductors is extremely small and especially in low fields hardly experimentally inaccessible. With a new type of calorimeter we have been able to resolve a small lambda anomaly within a narrow temperature range around the Hc2 line. We show that the evolution of the anomaly as a function of magnetic field follows scaling laws expected in the presence of critical fluctuations. The lower onset of the fluctuation regime shows many characteristics of a continuous solid-to-liquid transition in the vortex matter. It can be driven into a first-order vortex melting transition by a small AC field which helps the vortex matter to reach equilibrium.
Junod Alain
Lin Fu
Lortz Rolf
Musolino Nicolas
Rosenstein Baruch
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