H-T magnetic phase diagrams of electron-doped Sm1-xCaxMnO3
Respaud, M Rakoto, H Broto, JM Vanacken, Johan Martin, C Maignan, A Raveau, B Askenazy, S #
Elsevier science bv
Physica B vol:294 pages:119-123
The magnetic properties of the polycrystalline electron-doped manganites Sm1-xCaxMnO3 have been studied for 1 greater than or equal to x greater than or equal to 0.67 under high magnetic fields up to 50T.H-T phase diagrams have been established. Doping the G-type AFM parent compound CaMnO3 leads to partial FM correlations superimposed on a AFM component. The former phenomena reaches its maximum strength for x = 0.88-0.9. For x = 0.8 and below, abrupt metamagnetic transitions occur from the AFM ground state to the FM state with large hysteresis between the first magnetization and remanence curves. This phenomena corresponds to the melting of the orbital- or charge-ordered phases. At intermediate concentrations close to x = 0.85, the magnetization curves exhibit first a FM component and then a metamagnetic transition, so that this behavior can thus be viewed as a sum of the two types of previous behaviors, clearly showing the occurrence of phase separation. (C) 2001 Elsevier Science B.V. All rights reserved.