High dielectric constant in calcium-substituted GdMnO3 for storage device applications Supriya Priyadarshinee, Jayashree Pati, Ranjita Mahapatra, Pragyan Mohanty, Jyoshnarani Mohapatra and Dilip Kumar Mishra Eur. Phys. J. Plus, 140 5 (2025) 360 Published online: 05 May 2025 DOI: 10.1140/epjp/s13360-025-06307-y