1208.3336 (G. Lemarié et al.)

Universal scaling of the order-parameter distribution in strongly
disordered superconductors    [PDF]

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.

View original: http://arxiv.org/abs/1208.3336