Electronic and magnetic transitions in Bi–Sr–Mn–O oxides: high temperature charge-ordering

Abstract Neutron/synchrotron diffraction data and magnetic measurements provide direct evidence of charge/orbital ordering at anomalously high temperatures in (Bi,Sr)MnO 3 manganites. We report on the electronic and magnetic transitions of several oxides of this family. A mechanism based on the 6s 2 lone pair of Bi is proposed to strongly decrease the mobility of e g electrons and markedly favor charge-ordering.