Spin-induced multiferroicity in the binary perovskite manganite Mn2O3 by Cong, J, Zhai, K, Chai, Y, Shang, D, Khalyavin, DD, Johnson, RD, Kozlenko, DP, Kichanov, SE, Abakumov, AM, Tsirlin, AA, Dubrovinsky, L, Xu, X, Sheng, Z, Ovsyannikov, SV, Sun, Y