Two-band superconducting square with a central defect: role of the deGennes extrapolation length Thiago Nunes Jorge, Cristhian Aguirre, Alberto de Arruda and José Barba-Ortega Eur. Phys. J. B, 93 4 (2020) 69 Published online: 13 April 2020 DOI: 10.1140/epjb/e2020-100418-4