Coulomb Gap and Correlated Vortex Pinning in Superconductors

Details Coulomb Gap and Correlated Vortex Pinning in Superconductors Coulomb Gap and Correlated Vortex Pinning in Superconductors

1994-12-05

arxiv.org/abs/cond-mat/9412021v2

Phys. Rev. Lett. 74 (1995) 5132

Physics

Condensed Matter

10 pages, Revtex, 4 figures appended as uu-encoded postscript files, also available as hardcopies from tauber@cmt.harvard.edu

Scientific paper

10.1103/PhysRevLett.74.5132

The positions of columnar pins and magnetic flux lines determined from a decoration experiment on BSCCO were used to calculate the single--particle density of states at low temperatures in the Bose glass phase. A wide Coulomb gap is found, with gap exponent $s \approx 1.2$, as a result of the long--range interaction between the vortices. As a consequence, the variable--range hopping transport of flux lines is considerably reduced with respect to the non--interacting case, the effective Mott exponent being enhanced from $p_0 = 1/3$ to $p_{\rm eff} \approx 0.5$ for this specific experiment.

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