Phase Transitions and Magnetic Order in La 1-x Sr x MnO 3$\mathplus$$\updelta$ (x$\leq$ 0.2$\mathsemicolon$ 2.85$\leq$ 2-$\updelta$$\leq$ 3.00)

Eriksson, S.G.; Valkeapää, M.; Ivanov, S.; Eriksen, J.; Rundlöf, H.; Johansson, L.G.; Mathieu, R.; Svedlindh, P.; Bäckström, J.; Börjesson, L.

Авторы: Eriksson S.G., Valkeapää M., Ivanov S., Eriksen J., Rundlöf H., Johansson L.G., Mathieu R., Svedlindh P., Bäckström J., Börjesson L.
Журнал: Ferroelectrics
Том: 269
Номер: 1
Год издания: 2002
Издательство: Taylor and Francis
Местоположение издательства: United States
Первая страница: 309
Последняя страница: 314
DOI: 10.1080/00150190211131
Аннотация: The system, La 1 m x Sr x MnO 3 m i (0.0 h x h 0.2; 2.85 h 3 m i h 3.00), has been studied by neutron powder diffraction and Raman scattering. The x= 0.0 and x= 0.1 samples with 3 m i , 3.00, both show orthorhombic lattice symmetry, space group Pnma. La 0.8 Sr 0.2 MnO 3.00 on the other hand show rhombohedral lattice symmetry (space group R-3c) irrespective of temperature. At 130 K and below all the oxidised samples investigated show ferromagnetic order. LaMnO 3 m i does at 10 K show a total magnetic moment of 3.17(4) w B , directed along the c-axes. With an increase in temperature the preferred direction of the magnetic moment become less obvious, and finally, the magnetic order is lost. Quenched samples such as LaMnO 2.85 show monoclinic lattice symmetry. Below , 150 K extra magnetic peaks appear corresponding to an antiferromagnetic order. The doped system, La 0.9 Sr 0.1 MnO 2.85 on the other hand show a sequence of transitions (paramagnetic to ferromagnetic to antiferromagnetic). Raman work on the oxidised samples show an orthorhombic and a rhombohedral phase but it also becomes clear that the rhombohedral phase show a high degree of local distortions.
Добавил в систему: Иванов Сергей Александрович

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Phase Transitions and Magnetic Order in La 1-x Sr x MnO 3$\mathplus$$\updelta$ (x$\leq$ 0.2$\mathsemicolon$ 2.85$\leq$ 2-$\updelta$$\leq$ 3.00)статья Исследовательская статья

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