Low Temperature Physics: 28, 569 (2002); https://doi.org/10.1063/1.1496669 (5 pages)
Физика Низких Температур: Том 28, Выпуск 7 (Июль 2002), c. 790-795    ( к оглавлению , назад )

Magnetic phase transitions in the system La1-xBixMnO3+l

I. O. Troyanchuk and O. S. Mantytskaja

Institute of Solid State and Semiconductor Physics of National Academy of Sciences of Belarus 17 P. Brovki Str., Minsk 220072, Belarus
E-mail: troyan@ifttp.bas-net.by

H. Szymczak

Institute of Physics of Polish Academy of Sciences 32/46 Al. Lotnikow Str., Warsaw PL-02-668, Poland

M. Yu. Shvedun

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukrain

Received January 4, 2002

Аннотация

The crystal structure and magnetic properties of the La1-xBixMnO3+l system( ; 0 £ x1£ l £ 0.08 ) are studied as functions of the oxygen and bismuth contents. In oxidized samples La1-xBixMnO3+l a phase transition from a ferromagnetic state (rhombohedric phase) to a state of the spin glass type (quasitetragonal phase) is observed with increase of the bismuth concentration. The reduced samples La1-xBixMnO3 are weak ferromagnets down to x £ 0.6 and then transform into a ferromagnetic state. It is supposed that the Bi3+ ions stabilize the dx²-y² orbitals in the nearest Mn3+ ions whereas the dz² orbitals of the La3+ ions are stabilized. The orbitally disordered phases and dx²-y² - orbitally ordered phases are ferromagnetic, the dz² - orbitally ordered phases show antiferromagnetic ordering, and the state of the orbital glass type corresponds to a state of the spin glass type.

PACS:
72.15.Gd - Galvanomagnetic and other magnetotransport effects (see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport)
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
75.70.Pa -