Electronic and magnetic transitions in Bi-Sr-Mn-O oxides: high temperature charge-ordering
Garcia-Munoz, JL × Frontera, C Aranda, MAG Ritter, C Llobet, A Ranno, L Respaud, M Vanacken, Johan Broto, JM #
North-Holland Pub. Co.
Journal of Magnetism and Magnetic Materials vol:242 pages:645-647
Neutron/synchrotron diffraction data and magnetic measurements provide direct evidence of charge/orbital ordering at anomalously high temperatures in (Bi,Sr)MnO3 manganites. We report oil 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. (C) 2002 Elsevier Science B.V. All rights reserved.