Structural and magnetic phase transitions in La0.9Sr0.1MnO3

A study is made of phase transitions in doped La0.9Sr0.1MnO3 compounds usin g combined x-ray, electrical, and magnetic measurements. Structural phase t ransitions are observed accompanied by a change in the cell volume at tempe ratures of 100-110 K and 300-340 K. These structural changes are found to b e related to different contributions of the rhombic Jahn-Teller Q(2) mode t o the formation of the crystal lattice. The structural transition at 100-11 0 K is accompanied by distinctive magnetic and electrical properties. The d ata are analyzed in detail. (C) 1999 American Institute of Physics. [S1063- 7834(99)02906-8].