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Abstract

Phys. Rev. Lett. 95, 057004 (2005)

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Percolation Transition in the Heterogeneous Vortex State of NbSe2

O. Dogru, E. Y. Andrei, and M. J. Higgins

Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855, USA

S. Bhattacharya

Tata Institute of Fundamental Research, Mumbai 400-005, India

(Received 29 July 2004; revised 2 March 2005; published 29 July 2005)

A percolation transition in the vortex state of a superconducting 2H-NbSe2 crystal is observed in the regime where vortices form a heterogeneous phase consisting of ordered and disordered domains. The transition is signaled by a sharp increase in critical current that occurs when the volume fraction of disordered domains reaches the value Pc=0.260.04. Measurements on different vortex states show that, while the temperature of the transition depends on history and measurement speed, the value of Pc and the critical exponent characterizing the approach to it, r=1.970.66, are universal.

URL: http://link.aps.org/abstract/PRL/v95/e057004

doi:10.1103/PhysRevLett.95.057004

PACS: 74.25.Dw, 74.25.Bt, 74.25.Fy, 74.25.Qt

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References

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