Thermal fluctuations and vortex melting in the Nb3 Sn superconductor from high resolution specific heat measurements

R. Lortz*, F. Lin, N. Musolino, Y. Wang, A. Junod, Rosenstein Baruch, N. Toyota

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The range of critical thermal fluctuations in "classical" bulk superconductors is extremely small and especially in low fields hardly experimentally accessible. 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.

Original languageEnglish
Article number104502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number10
DOIs
StatePublished - 11 Sep 2006

Fingerprint Dive into the research topics of 'Thermal fluctuations and vortex melting in the Nb3 Sn superconductor from high resolution specific heat measurements'. Together they form a unique fingerprint.

Cite this