The magnetic transitions in La1-xCaxMnO3 (x = 0.25,0.50) were studied by synchrotron x-ray and neutron powder diffraction. For x = 0.25 the large ΔV = 0.13% at TC is due to the simultaneous insulator-to-metal transition. For x = 0.50 below Tc we observed a drastic decrease of the b axis and an increase of the a and c axes, due to a Jahn-Teller distortion of MnO6 octahedra. The ferromagnetic transition for x = 0.50 is accompanied by an unusual peak broadening terminating at TN This newly observed behavior can be explained assuming that multiple intermediate phases are simultaneously present in the sample.
ASJC Scopus subject areas
- Physics and Astronomy(all)