Perturbation of exchange interaction in Nd–Ni spin subsystem of nickelate Rahul Kumar Saha, Souvik Halder and Ajay Kumar Ghosh Eur. Phys. J. Plus, 138 3 (2023) 247 Published online: 16 March 2023 DOI: 10.1140/epjp/s13360-023-03876-8