Materiality of antimony doping in Ge–S amorphous chalcogenides in nonlinear switching Anjani Kumar, S. Shukla, S. Kumar and Rajeev Gupta Eur. Phys. J. Plus, 140 2 (2025) 146 Published online: 21 February 2025 DOI: 10.1140/epjp/s13360-025-06088-4