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: | 1-九月-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 |
顯示於類別: | 期刊論文 |