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Coulomb Gap and Correlated Vortex Pinning in Superconductors

Uwe C. Täuber·Hongjie Dai·David R. Nelson·Charles M. Lieber
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Abstract

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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Uwe C. Täuber, Hongjie Dai, David R. Nelson, Charles M. Lieber. 1994-12-09. Coulomb Gap and Correlated Vortex Pinning in Superconductors. https://doi.org/10.1103/physrevlett.74.5132

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