Fizika Nizkikh Temperatur: Volume 31, Number 8-9 (August 2005), p. 1073-1080    ( to contents , go back )

Antiferromagnet-ferromagnet phase transition in lightly doped manganites

I.O. Troyanchuk and V.A. Khomchenko

Institute of Solid State and Semiconductor Physics, NAS, 17 P. Brovka Str., Minsk 220072, Belarus

V.V. Eremenko and V.A. Sirenko

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

H. Szymczak

Institute of Physics, PAS, 32/46 Lotnikow Str., Warsaw 02-668, Poland
pos Анотація:

Received February 18, 2005


Magnetic and structural phase diagrams of the La0.88MnOx, La1–xSrx(Mn1–x/2Nbx/2)O3, Nd1–xCaxMnO3, and Bi1–xCaxMnO3 series constructed on the basis of x-ray, neutron powder diffraction, Young’s modulus, magnetization and resistivity measurements are presented. It is shown that the main factor controlling the antiferromagnet–ferromagnet phase transition in the manganites is a type of an orbital state. The results are discussed in the framework of structurally driven magnetic phase separation model.

75.30.Vn -
75.30.Cr - Saturation moments and magnetic susceptibilities
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