G. Lemarié, A. Kamlapure, D. Bucheli, L. Benfatto, J. Lorenzana, G. Seibold, S. C. Ganguli, P. Raychaudhuri, C. Castellani
We investigate theoretically and experimentally the statistical properties of the inhomegeneous order-parameter distribution (OPD) at the verge of the superconducting-insulator transition (SIT). We find within two prototype fermionic and bosonic models for disordered superconductors that one can identify an universal rescaling of the OPD. By performing scanning-tunneling microscopy experiments in three samples of NbN with increasing disorder we show that such a rescaling describes also with an excellent accuracy the experimental data. These results can provide a breakthrough in our understanding of the SIT.
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http://arxiv.org/abs/1208.3336
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