Low Temperature Physics: 28, 569 (2002); https://doi.org/10.1063/1.1496669 (5 pages)
Fizika Nizkikh Temperatur: Volume 28, Number 7 (July 2002), p. 790-795    ( to contents , go back )

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
pos Анотація:

Received January 4, 2002

Abstract

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 -

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