Физика Низких Температур: Том 31, Выпуск 8-9 (Август 2005), c. 1073-1080    ( к оглавлению , назад )

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
E-mail: troyan@ifttp.bas-net.by

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
E-mail: sirenko@ilt.kharkov.ua

H. Szymczak

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

Received February 18, 2005

Аннотация

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.

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