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Percolation Transition in the Heterogeneous Vortex State of NbSe2 O. Dogru, E. Y. Andrei, and M. J. Higgins
 

Summary: 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 manuscript received 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 0:26 0:04. 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 1:97 0:66, are universal.
DOI: 10.1103/PhysRevLett.95.057004 PACS numbers: 74.25.Dw, 74.25.Bt, 74.25.Fy, 74.25.Qt
Recent imaging experiments [1] on vortex matter in
superconductors have revealed a heterogeneous state con-
sisting of domains of ordered and disordered phases [2,3].
The appearance of heterogeneity coincides with the obser-
vation of striking anomalies including the peak effect [4],
nonlinear response [5], metastability, and history effects
[6]. It is well known that multicomponent systems undergo

  

Source: Andrei, Eva Y. - Department of Physics and Astronomy, Rutgers University

 

Collections: Materials Science; Physics