Physics – Condensed Matter – Superconductivity
Scientific paper
2006-02-28
Pramana 66, 83 (2006)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1007/BF02704939
The existence of a peak effect in transport properties (a maximum of the critical current as function of magnetic field) is a well-known but still intriguing feature of type II superconductors such as NbSe2 and Bi-2212. Using a model of pinning by surface irregularities in anisotropic superconductors, we have developed a calculation of the critical current which allows estimating quantitatively the critical current in both the high critical current phase and in the low critical current phase. The only adjustable parameter of this model is the angle of the vortices at the surface. The agreement between the measurements and the model is really very impressive. In this framework, the anomalous dynamical properties close to the peak effect is due to co-existence of two different vortex states with different critical currents. Recent neutron diffraction data in NbSe2 crystals in presence of transport current support this point of view.
Battacharya Shobo
Brulet Annie
Goupil Christophe
Higgins Mark J.
Mathieu Patrice
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