標題: Thermal fluctuations and vortex melting in the Nb3Sn superconductor from high resolution specific heat measurements
作者: Lortz, R.
Lin, F.
Musolino, N.
Wang, Y.
Junod, A.
Rosenstein, B.
Toyota, N.
交大名義發表
電子物理學系
National Chiao Tung University
Department of Electrophysics
公開日期: 1-Sep-2006
摘要: 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 H-c2 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.
URI: http://dx.doi.org/10.1103/PhysRevB.74.104502
http://hdl.handle.net/11536/11805
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.74.104502
期刊: PHYSICAL REVIEW B
Volume: 74
Issue: 10
起始頁: 0
結束頁: 0
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